LU-16456 tests: skip conf-sanity test_129 in interop

LU-16456 tests: skip conf-sanity test_129 in interop

test_129 was added in commit v2_14_56-40-gcefabee52
It should be skipped for older MDS versions.

Lustre-change: https://review.whamcloud.com/49601
Lustre-commit: 7e566c6a1f9d5324718ebc7149153f3272363b9c

Test-Parameters: trivial testlist=conf-sanity env=ONLY=129 serverversion=EXA6.2.0
Fixes: cefabee52 ("LU-15112 mgc: do not ignore target registration failure")
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: If1e276c816ecf2f30dc970f9b5afe85d722540e5
Reviewed-by: Sergey Cheremencev <scherementsev@ddn.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Sarah Liu <sarah@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/53452
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Alex Deiter <alex.deiter@gmail.com>