Add corosync and pacemaker properties into overcloud template

Pacemaker will be used for managing ceilometer central agent,
we need basic metadata to setup corosync and pacemaker.

Related to: Ifa83d62c2132bcdcb40d0b7c80ce3adadc0b5587

Change-Id: I44909005d9bc653c3e7c2de1c12fe4ffecf6bede
Merge "Add corosync and pacemaker properties into overcloud template"