Added new task to configure Docker.

Added new task ``setup_default_docker`` to install and configure
``Docker`` as a viable ``Compute Resource`` for a Satellite 6 system.

```bash
[cloud-qe-8.example.com] Executing task 'setup_default_docker'
rhel 7
[cloud-qe-8.example.com] run: yum install -y docker
[cloud-qe-8.example.com] out: Loaded plugins: product-id
[cloud-qe-8.example.com] out: Resolving Dependencies
[cloud-qe-8.example.com] out: --> Running transaction check
[cloud-qe-8.example.com] out: ---> Package docker.x86_64 0:1.2.0-1.8.el7 will be installed
[cloud-qe-8.example.com] out: --> Finished Dependency Resolution
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: Dependencies Resolved
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: ======================================================================================================================
[cloud-qe-8.example.com] out:  Package              Arch                 Version                      Repository                               Size
[cloud-qe-8.example.com] out: ======================================================================================================================
[cloud-qe-8.example.com] out: Installing:
[cloud-qe-8.example.com] out:  docker               x86_64               1.2.0-1.8.el7                rhel-7-server-extras-rpms               5.5 M
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: Transaction Summary
[cloud-qe-8.example.com] out: ======================================================================================================================
[cloud-qe-8.example.com] out: Install  1 Package
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: Total download size: 5.5 M
[cloud-qe-8.example.com] out: Installed size: 24 M
[cloud-qe-8.example.com] out: Downloading packages:
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              0% [                                   ]  0.0 B/s |    0 B  --:--:-- ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              0% [                                   ]  0.0 B/s |  43 kB  --:--:-- ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              2% [-                                  ]  87 kB/s | 134 kB  00:01:03 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              5% [=-                                 ] 111 kB/s | 301 kB  00:00:48 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              7% [==-                                ] 127 kB/s | 440 kB  00:00:40 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              12% [====                              ] 169 kB/s | 718 kB  00:00:29 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              16% [=====                             ] 188 kB/s | 901 kB  00:00:25 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              19% [======-                           ] 204 kB/s | 1.1 MB  00:00:22 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              22% [=======-                          ] 221 kB/s | 1.2 MB  00:00:19 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              25% [========-                         ] 244 kB/s | 1.4 MB  00:00:17 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              27% [=========                         ] 240 kB/s | 1.5 MB  00:00:17 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              31% [==========-                       ] 264 kB/s | 1.7 MB  00:00:14 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              32% [===========                       ] 259 kB/s | 1.8 MB  00:00:14 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              36% [============                      ] 282 kB/s | 2.0 MB  00:00:12 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              37% [============-                     ] 274 kB/s | 2.1 MB  00:00:12 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              41% [==============                    ] 296 kB/s | 2.3 MB  00:00:11 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              43% [==============-                   ] 290 kB/s | 2.4 MB  00:00:10 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              46% [===============-                  ] 311 kB/s | 2.6 MB  00:00:09 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              48% [================-                 ] 304 kB/s | 2.7 MB  00:00:09 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              52% [=================-                ] 323 kB/s | 2.9 MB  00:00:08 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              54% [==================                ] 317 kB/s | 3.0 MB  00:00:08 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              57% [===================               ] 328 kB/s | 3.1 MB  00:00:07 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              59% [====================              ] 335 kB/s | 3.3 MB  00:00:06 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              61% [====================-             ] 330 kB/s | 3.4 MB  00:00:06 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              65% [======================            ] 346 kB/s | 3.6 MB  00:00:05 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              67% [======================-           ] 340 kB/s | 3.7 MB  00:00:05 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              70% [========================          ] 357 kB/s | 3.9 MB  00:00:04 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              73% [========================-         ] 359 kB/s | 4.0 MB  00:00:04 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              75% [=========================-        ] 352 kB/s | 4.1 MB  00:00:03 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              78% [==========================-       ] 368 kB/s | 4.3 MB  00:00:03 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              80% [===========================       ] 369 kB/s | 4.4 MB  00:00:02 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              82% [============================      ] 365 kB/s | 4.6 MB  00:00:02 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              86% [=============================     ] 380 kB/s | 4.8 MB  00:00:02 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              88% [==============================    ] 380 kB/s | 4.9 MB  00:00:01 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              90% [==============================-   ] 374 kB/s | 5.0 MB  00:00:01 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              94% [================================  ] 388 kB/s | 5.2 MB  00:00:00 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              96% [================================- ] 391 kB/s | 5.3 MB  00:00:00 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm              99% [=================================-] 385 kB/s | 5.4 MB  00:00:00 ETA
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: docker-1.2.0-1.8.el7.x86_64.rpm                                                                | 5.5 MB  00:00:16
[cloud-qe-8.example.com] out: Running transaction check
[cloud-qe-8.example.com] out: Running transaction test
[cloud-qe-8.example.com] out: Transaction test succeeded
[cloud-qe-8.example.com] out: Running transaction
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [                                                                    ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#                                                                   ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [##                                                                  ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [###                                                                 ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [####                                                                ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#####                                                               ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [######                                                              ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#######                                                             ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [########                                                            ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#########                                                           ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [##########                                                          ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [###########                                                         ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [############                                                        ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#############                                                       ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [##############                                                      ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [###############                                                     ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [################                                                    ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#################                                                   ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [##################                                                  ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [###################                                                 ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [####################                                                ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#####################                                               ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [######################                                              ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#######################                                             ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [########################                                            ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#########################                                           ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [##########################                                          ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [###########################                                         ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [############################                                        ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#############################                                       ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [##############################                                      ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [###############################                                     ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [################################                                    ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#################################                                   ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [##################################                                  ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [###################################                                 ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [####################################                                ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#####################################                               ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [######################################                              ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#######################################                             ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [########################################                            ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#########################################                           ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [##########################################                          ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [###########################################                         ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [############################################                        ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#############################################                       ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [##############################################                      ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [###############################################                     ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [################################################                    ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#################################################                   ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [##################################################                  ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [###################################################                 ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [####################################################                ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#####################################################               ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [######################################################              ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#######################################################             ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [########################################################            ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#########################################################           ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [##########################################################          ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [###########################################################         ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [############################################################        ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#############################################################       ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [##############################################################      ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [###############################################################     ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [################################################################    ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [#################################################################   ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [##################################################################  ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64 [################################################################### ] 1/1
[cloud-qe-8.example.com] out:   Installing : docker-1.2.0-1.8.el7.x86_64                                                                        1/1
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out:   Verifying  : docker-1.2.0-1.8.el7.x86_64                                                                        1/1
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: Installed:
[cloud-qe-8.example.com] out:   docker.x86_64 0:1.2.0-1.8.el7
[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: Complete!
[cloud-qe-8.example.com] out:

[cloud-qe-8.example.com] run: usermod -aG docker apache
rhel 7
[cloud-qe-8.example.com] run: echo "OPTIONS=--selinux-enabled -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock" >> /etc/sysconfig/docker
rhel 7
[cloud-qe-8.example.com] run: systemctl restart docker
[cloud-qe-8.example.com] run: docker ps
[cloud-qe-8.example.com] out: CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
[cloud-qe-8.example.com] out:

[cloud-qe-8.example.com] run: docker pull busybox
[cloud-qe-8.example.com] out: Pulling repository busybox

[cloud-qe-8.example.com] out: d940f6fef591: Pulling image (ubuntu-14.04) from busybox, endpoint: https://registry-1.docker.io/v1/

[cloud-qe-8.example.com] out: d415c60e5ea3: Pulling image (ubuntu-12.04) from busybox, endpoint: https://registry-1.docker.io/v1/

[cloud-qe-8.example.com] out: e72ac664f4f0: Pulling image (buildroot-2014.02) from busybox, endpoint: https://registry-1.docker.io/v1/

[cloud-qe-8.example.com] out: d940f6fef591: Pulling dependent layers

[cloud-qe-8.example.com] out: d415c60e5ea3: Pulling dependent layers
[cloud-qe-8.example.com] out:

[cloud-qe-8.example.com] out: 511136ea3c5a: Downloading [=================>

[cloud-qe-8.example.com] out: 511136ea3c5a: Download complete

[cloud-qe-8.example.com] out: df7546f9f060: Downloading [============================================

[cloud-qe-8.example.com] out: df7546f9f060: Download complete

[cloud-qe-8.example.com] out: 25fb2184d4af: Downloading [>

[cloud-qe-8.example.com] out: 25fb2184d4af: Downloading [=>

[cloud-qe-8.example.com] out: 25fb2184d4af: Downloading [=>

[cloud-qe-8.example.com] out: 25fb2184d4af: Downloading [==>

[cloud-qe-8.example.com] out: 25fb2184d4af: Downloading [==>

[cloud-qe-8.example.com] out: 25fb2184d4af: Downloading [===>

[cloud-qe-8.example.com] out: 25fb2184d4af: Downloading [===>

[cloud-qe-8.example.com] out: 25fb2184d4af: Downloading [====>

[cloud-qe-8.example.com] out: 25fb2184d4af: Downloading [====>

[cloud-qe-8.example.com] out: 25fb2184d4af: Downloading [=====>

[cloud-qe-8.example.com] out: 25fb2184d4af: Downloading [=====>

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[cloud-qe-8.example.com] out: d415c60e5ea3: Download complete =======================================[cloud-qe-8.example.com] out: 0dfaa2625e19: Downloading [============================================[cloud-qe-8.example.com] out:
[cloud-qe-8.example.com] out: 0dfaa2625e19: Downloading [============================================
[cloud-qe-8.example.com] out: 0dfaa2625e19: Downloading [============================================
[cloud-qe-8.example.com] out: 0dfaa2625e19: Download complete
[cloud-qe-8.example.com] out:

Done.
Disconnecting from cloud-qe-8.example.com... done.
```
To make easier to "maintain" and visualize options can you change the format to:

```python
my_list = [
    '1',
    '2',
    '...',
]
```