LU-4591 lov: cancel ungranted sub lock

LU-4591 lov: cancel ungranted sub lock

When the top lock is canceled due to error, we should cancel
ungranted sub lock otherwise the sublock state is undefined.

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Change-Id: I5c1df5220ce77ff434463d6443135c625e79ea04
Reviewed-on: http://review.whamcloud.com/9524
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>