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.

backport from http://review.whamcloud.com/9524

Signed-off-by: Shuichi Ihara <sihara@ddn.com>
Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Change-Id: Ifa68743cd5bf3a9d69258014d066124fd7fc87c9
Reviewed-on: http://review.whamcloud.com/9851
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>