Add openstack_extras and epel dependency

* Required for pacemaker service provider wrappers
  implementation.
* Add Puppet-openstack_extras module which comes to replace
  puppet-openstack in upstream.
  commit sha: b0b83dbf4507db36220f9c04c68e4788109b1c4b
  Source: https://github.com/stackforge/puppet-openstack_extras
* Add a dependency epel module
  v1.0.0 db0cdeba51739e748c965974ec832acada227084
  Source: https://github.com/stahnma/puppet-module-epel

Related blueprint pacemaker-improvements

Change-Id: Ib607cd77d56e55489e2a855c7ca933b8eb9fcaee
Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>
Merge "Add openstack_extras and epel dependency"