Add support for the new centos-glusterNN repo

[vide]

As you can see by going to the default repo this module try to add by default:

https://download.gluster.org/pub/gluster/glusterfs/LATEST/EPEL.repo/

GlusterFS RPMs in CentOS at least has been moved, even in the official site, to a dedicate storage repo which can be easily installed and configured by installing an RPM. Right now this puppet module is broken on CentOS 7.2. I can prepare a PR in the next days if you want