LU-17165 tests: stable count in recovery-small/141

LU-17165 tests: stable count in recovery-small/141

The lock cancellation and fetching the lock count on the OST
is racy and can randomly be "0" or "23" either before or after
the OST is restarted.  Wait until the count has stabilized to
ensure the test can pass consistently.

Test-Parameters: trivial testlist=recovery-small
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Ib6d6fdeb721d6ff85a366e58c621ed7b883ebbe5
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56945
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Tested-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>