Upgrades: wait for galera to be settled
Upgrades: wait for galera to be settled

We also need to wait for the galera resource to settle down
before we proceed starting up with the other services.

Note that before merging this, we need to land the following
change in ansible-pacemaker:
https://review.gerrithub.io/#/c/351387/

Change-Id: Id71c9cb41cfd4c17685c922db2683e28ab7588fd
Closes-Bug: #1668372

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,dprince/tripleo-heat-templates