oop: add missing utils.forceLink

Bug-Url: https://bugzilla.redhat.com/1120721
Change-Id: I58745450b962844211585874460574f000c441cc
Signed-off-by: Yeela Kaplan <ykaplan@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/29634
Reviewed-by: Saggi Mizrahi <smizrahi@redhat.com>
Tested-by: Saggi Mizrahi <smizrahi@redhat.com>