LU-16341 tests: skip sanity-quota/test_14 for old MDS

LU-16341 tests: skip sanity-quota/test_14 for old MDS

Skip sanity-quota test_14 for old MDS missing the fix
for LU-16341 kernel NULL in qmt_site_recalc_cb.

Lustre-change: https://review.whamcloud.com/51949
Lustre-commit: TBD (from 7d359e4de4a0159ac0fc1d15a18e93ca24d4e360)

Fixes: d965d63415 ("LU-16341 quota: fix panic in qmt_site_recalc_cb")
Test-Parameters: trivial testlist=sanity-quota env=ONLY=14
Signed-off-by: Alex Deiter <adeiter@tintri.com>
Change-Id: I1a23daa06f0cd306c2b034df18617c2650945b28
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/51950
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>