Merge branch 'rhel7' into 'master'

Support for rhel 7 provisioning for lab test nodes

I might end up tweaking this a bit more, but I didn't want to wait to any longer to create this PR.

If you've got any questions about how to run this, let me know.  This is the command I've been using though.

ansible-playbook -i octo testnodes.yml -vv --limit magna085*

You can use --limit there to target any specific node or set of nodes (look at the octo file for available nodes).  If you want to make sure what nodes or tasks will run for that playbook --list-tasks and --list-hosts are really helpful.  I believe you can also just say -i fqdn

You'll need to get the key to unlock the subscription_manager secrets. You can find that at magna002:/etc/ansible/.vault_pass.txt.  Move that file to ~/.vault_pass.txt wherever you plan to run ansible from.

Note: I'm unsure how well rhel 7.1 will actually work, so I changed the title.