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: I4f493bf92a2ab28b4833cdcb46ed3a8a9a92fc0f
Closes-bug: #1336233