Clarify the different utility of Corosync version 1 and 2
Clarify the different utility of Corosync version 1 and 2

Change-Id: I05ce8c9c542f355a0820e24ac01f3526e90b7ea1
Closes-Bug: #1762882

openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals