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: Ic6397e878fdca747f33e47f05e846d25f061ce7b
Closes-bug: #1336233
Merge "Sync time on nodes before checking Ceph health" into stable/5.0