Test Ansible roles and playbooks using Docker

[chris meyers]

I've created a role, provision_docker, to help test Ansible roles and playbooks. It's simple and leverages Docker (not vms).

Highlights:

• Best practice directory structure
• Test roles/playbooks using docker (spin up multiple hosts [1])
• Plays nicely with TravisCI, (see example repos below [1] [2] [3] [4])
• Curated Dockerfile's centos 6/7 ubuntu 12.04/14.04 images w/ init system and ssh enabled

Example Uses:

1. HA mongo chrismeyersfsu/role-install_mongod
   
2. Ansible hacking/development env bringup chrismeyersfsu/ansible_test_deps
   
3. iptables chrismeyersfsu/role-iptables
   
4. devstack (openstack on a single machine) chrismeyersfsu/role-devstack
   

Feedback welcome!