Don't user sudo in fuser

Change-Id: I74842ffda1bc1d5ebb54de5e1933fedd851e745b
Signed-off-by: Saggi Mizrahi <smizrahi@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/13779
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Tested-by: Antoni Segura Puimedon <asegurap@redhat.com>