Add Galera as a Pacemaker resource when EnablePacemaker

Add Galera as a Pacemaker resource when EnablePacemaker

This commit aims to support the creation of the galera cluster via
Pacemaker. With this commit in, three use-cases will be supported.

 * Non HA setup / Non Pacemaker setup : The deployment will take place
as it is currently the case in f20puppet-nonha. Nothing changes.

 * Non HA setup / Pacemaker setup : Even though it is a non ha setup,
galera cluster via pacemaker  will be deployed with a cluster nbr of 1.

 * HA setup / Non Pacemaker setup : N/A

 * HA setup / Pacemaker setup : It is assumed that HA setup will
always be with pacemaker.  So in this situation pacemaker will deploy a
cluster of 3 galera master nodes.

Depends-On: I7aed9acec11486e0f4f67e4d522727476c767d83
Change-Id: If0c37a86fa8b5aa6d452129bccf7341a3a3ba667