LU-17269 tests: exclude conf-sanity/41c

LU-17269 tests: exclude conf-sanity/41c

It appears that conf-sanity test_41c has started crashing recently,
likely due to running test sessions with multiple MDTs by default.
Exclude this subtest until it is fixed.

Test-Parameters: trivial testlist=conf-sanity env=ONLY=41c,HONOR_EXCEPT=y
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I3d88459d6c51d37fd3c489541077541d97384910
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54744
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>