engine: Fix typo

Thiss patch fixes a minor spelling issue in MoM policy synchronization;
Cluster--> Host --> "Synch Mom Policy" should be "Sync MoM Policy".

Change-Id: I325c14e8b5c3fc97d6293d80a7f05d68fe89a1b9
Bug-Url: https://bugzilla.redhat.com/1039275
Signed-off-by: Doron Fediuck <dfediuck@redhat.com>