vdsm: use startMonitoringDomain

Use startMonitoringDomain VDSM API for monitoring
hosted engine storage domain in order to support
shared:exclusive images without a pool.
Use getVdsStats for waiting the start of the domain
monitor.
Updated vdsm minimum version required according
to VDSM API documentation for startMonitoringDomain.

Change-Id: I3099081b79d461685901a1a32e9d526bd3bb758a
Requires: http://gerrit.ovirt.org/19762
Requires: http://gerrit.ovirt.org/20099
Bug-Url: https://bugzilla.redhat.com/1015136
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>