LU-17165 tests: fix recovery-small test_141

LU-17165 tests: fix recovery-small test_141

Wait for import generation change before counting the locks when the
MGS has been restarted. And to make things clearer, check lock count
on OST side.

Test-Parameters: trivial
Test-Parameters: mdscount=2 mdtcount=4 osscount=1 ostcount=8 clientcount=2 testlist=recovery-small env=ONLY=141,ONLY_REPEAT=20
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: Ie9526aa38e3a669b7865516a296dfeed438a83f3
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55591
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alex Deiter
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>