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.

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/fs/lustre-release/+/50638
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Lai Siyao <lai.siyao@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>