Glusterfs support for RHEL7,CentOS7,Fedora20

Requires Puppet module-data which is already in Openstack-Puppet-Modules.

Hiera is also required since this is relying on yaml datastores

Hiera is included by default but a symbolic link to the default /etc/hiera.yaml
configuration file must be created in /etc/puppet for puppet-hiera to
kick in properly.

https://bugzilla.redhat.com/show_bug.cgi?id=1091777