oop: add missing utils.forceLink

Bug-Url: http://bugzilla.redhat.com/1121694
Change-Id: I58745450b962844211585874460574f000c441cc
Signed-off-by: Yeela Kaplan <ykaplan@redhat.com>
Signed-off-by: Saggi Mizrahi <smizrahi@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/30545
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>
Tested-by: Yaniv Bronhaim <ybronhei@redhat.com>