core: restrict comp version of edit storage conn

Added upgrade script that restricts the compatibility version to 3.3
for edit of storage server connection due to bug in vdsm, so it will be
possible to edit storage server connection starting version 3.3.

Change-Id: I352a915ebaa06bbf9db7432a29aa006d25538b63
Signed-off-by: Alissa Bonas <abonas@redhat.com>