LU-17717 tests: skip sanity-lnet/252 for interop

LU-17717 tests: skip sanity-lnet/252 for interop

as the subtest fails finding the memory leak which has been
fixed recently.

Test-Parameters: trivial
Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: Ide80e0b39a053a2774804b025306ebdb1fc964a8
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54707
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>