LU-18320 tests: add skip option to sanity-lnet test_226

LU-18320 tests: add skip option to sanity-lnet test_226

Update sanity-lnet test_226 to be skipped if peer doesn't
have the refcount fix from LU-17440.

Test-Parameters: trivial testlist=sanity-lnet
Fixes: 2b210f3905 ("LU-17440 lnet: prevent errorneous decref for asym route")
Signed-off-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Change-Id: I274668048f3df27da1b226e9fb1966dbbd877713
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56839
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Frank Sehr <fsehr@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>