LU-15548 tests: skip conf-sanity/131 for older servers

LU-15548 tests: skip conf-sanity/131 for older servers

Skip conf-sanity.sh test_131 when running against older servers that
do not support the trusted.projid xattr.

Lustre-change: https://review.whamcloud.com/48151
Lustre-commit: 5fefbd10786f3f8705d2251071d8778d0de2835d

Test-Parameters: trivial testlist=conf-sanity env=ONLY=131
Test-Parameters: testlist=conf-sanity env=ONLY=131 serverversion=2.14.0
Fixes: e4d07f2c30 ("LU-12056 ldiskfs: add trusted.projid virtual xattr")
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: If1858502ab50ffd10e494eab793e3bc0f883fe9e
Reviewed-on: https://review.whamcloud.com/48264
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>