Packstack: add CentOS support
Merge pull request #9 from weshayutin/hacking

Remove handler in hacking/hello_world
Merge pull request #10 from weshayutin/centos

Packstack: add CentOS support
Refactor ntp into linux-common and make it depend on fedora and rhel common
Increase puppet wait to 30 seconds
Fix /etc/hosts generation
Packstack AIO: launch instance and install/test in openstack env

* Had to duplicate part of the get_nodes role for now
* Had to duplicate part of the set_facts