Sync time on nodes before checking Ceph health

System test 'ceph_ha' almost always fails while
checking ceph health due to clock skew. That's
why an additional time synchronization and restart
of Ceph service was added to the test.

Change-Id: I58af30d29399c70b9f5d142d3c495710f05994f2
Closes-bug: #1336233
Merge "Sync time on nodes before checking Ceph health"