LU-10391 tests: except sanity-lnet/253+254 due to failures

LU-10391 tests: except sanity-lnet/253+254 due to failures

Moving to Netlink for ping support has exposed a timing issues
with some of the sanity-lnet test.  Skip those tests temporarily
until the issue can be fixed.

Test-Parameters: trivial testlist=sanity-lnet
Signed-off-by: James Simmons <jsimmons@infradead.org>
Change-Id: Ia30fcbf8eca7baaf6f896e6e51229c69cea82804
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/53593
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>