Adding config entry for VDSM 4.14

Update SupportedVDSMVersions config value to support VDSM 4.14

Change-Id: I4e661ad31afb5599d4d7dd6370e5c9fb98e31863
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1067096
Signed-off-by: Eli Mesika <emesika@redhat.com>