Install Tmux and GNU Screen for TripleO Devtest

Devtest script takes a long time to finish, so we often use GNU Screen
or Tmux to run it, so that we don't have to be connected to the lab
machine all the time. Let's install them both so that users can use
their favorite one.

Change-Id: Iee8e511a020ba82e3cfb7e5307d536cc8f656984
Correct moved_libvirt_storage defaults location

Probably forgotten when extracting moved_libvirt_storage from
devtest_prereq.

Change-Id: I57694cbeb9de3d9af54bd334ec5d6631738dea85
Create devtestrc, make sure not to overwrite it

Using some sensible defaults in the spirit of:

https://wiki.openstack.org/wiki/Tuskar/Devtest

Change-Id: Ia6ed011969d3c4b0e238383eaa7bd374bec25ad7
Add TripleO Devtest documentation

Change-Id: I4eae1fd943747ea2139a791668d59336ca601a00
Split documentation into foreman/tripleo parts

Change-Id: I70945db40c34ff2fb9a8f67ed7124e7ccabed79a
Fix broken documentation links in readme

Change-Id: I602e0856f140e881d8d50b3bf01f845b15060256
merge in multi-node packstack work to master

Change-Id: Id4282819e2683c7a0a537fdf1aba99caf7753180
Testday: workarounds

Change-Id: I33ec22c0219cce9e8db6211d2050cc994e10c2e6
Removed Tasks, add Workarounds, minor wrkarounds for icehouse added

Change-Id: I395d782001b885a2e1100a1afe074f897ce3d6a2
MariaDB workaround, chown log file
ensure service is started prior to install
add mariadb and mysql log files to ensure mariadb started

Change-Id: I46f9759873a56b21ee9a6f0c5be5532516b13352
Updates to workarounds, tempest

Change-Id: I7768123206840b088b80c3f279e0ec88bc40a205
tempest: w/ testr you have to remove .testrepository before rerun
tempest: tests are passing w/ nosetest where they fail with testr. switching to nose

Change-Id: I756d1f03d62e476966eb9ea8c50c792d81ad1b3e
instructions for run.sh, skip workarounds by default

Change-Id: I284130c6ed68621627996e52d9a173346d17456f
Simplify the network setup on foreman

This change moves the vars in foreman-network-setup role to defaults.
Then, the defaults are overridden in group_vars/networker, making it
unnecessary to have the when: clause in the network setup.

Change-Id: Iad0937afb1932861733c69040e24563c7e4ca235
Add ability to set arbitrary hostgroup options

In order to set hostgroup options that are not in the seeds.rb (and
possibly move the seeds.rb manipulation to here), it is necessary to do
foreman api calls to change the default values.

Change-Id: Id0f1d2eaab2be9bfbc8d29a000bffd1df807cf17