ec2test master ip and repo ip
Merge pull request #16 from ros-infrastructure/master

merge changes from master into ec2test branch
self reference for reconfigure
changing to btrfs as filesystem storage
Merge branch 'master' into ec2test
fix branch, add master ip to repo config
add comments for setting up btrfs
using external devices with btrfs
updating from tested sequence
add python3-empy to repo
add docker to repo
switch to use docker module instead of custom code
Switch to use docker puppet module.

Add support for squid transparent proxy if run_squid is set in common.yaml.
fixing iptables rules to not break docker
fixing default iptables
enabling squid by default
adding required mangle section
add two more jenkins plugins
change master to exclusive mode
Merge branch 'ec2test_btrfs' into btrfs_merge_out