LU-16735 test: cancel MDC locks and wait recovery

LU-16735 test: cancel MDC locks and wait recovery

During test_35, the MDC LDLM locks should also be cancelled to
flush the pending operations and the recovery should be waited
to complete before checking the quota.

Lustre-change: https://review.whamcloud.com/50638
Lustre-commit: 6c42ca6e445ff41f17c92f1ec875479388a59212

Test-Parameters: trivial testlist=sanity-quota mdscount=2 mdtcount=4
Change-Id: I6508644976be77ad2895107abf90144b51790cfe
Signed-off-by: Hongchao Zhang <hongchao@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/50644
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>