LU-10584 tests: sanityn test 51d cancel layout lock

LU-10584 tests: sanityn test 51d cancel layout lock

Modify sanityn test 51d to cancel layout locks directly
using cancel_lru_locks.

Author: Bobi Jam <bobijam@whamcloud.com>

Test-Parameters: trivial testlist=sanityn
Test-Parameters: mdsjob=lustre-master ossjob=lustre-master serverbuildno=3807 testlist=sanityn
Signed-off-by: James Nunez <jnunez@whamcloud.com>
Change-Id: I603e99ad847d2726ff18c742db1f2d0b9f20e98b
Reviewed-on: https://review.whamcloud.com/33393
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Emoly Liu <emoly@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>