Make use of cluster size in mysql sanity checks.
Make use of cluster size in mysql sanity checks.

Due to the nature of the Synced status, we must also evaluate the
cluster size.  This commit makes those changes to the logic and adds
appropriate error messages to guide a user.

Change-Id: I48a1c3bd18924ef1a4e8528980f8138aaea01414

SpamapS/tripleo-ansible,SpamapS/tripleo-ansible