LU-16945 tests: skip sanity test_27Cg in interop

LU-16945 tests: skip sanity test_27Cg in interop

Sanity test_27Cg is testing functionality that was broken in older
MDS versions, but does not have a version check, so it causes testing
to timeout 100% of the time when running on older servers.  Skip it.

Fixes: d96b98ee6b63 ("LU-16693 lod: ENODEV on setstripe with wrong OST#")
Test-Parameters: trivial testlist=sanity env=ONLY=27Cg
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I52b3d4e6a78a0db8f48401b128e22372f3d8a9bd
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/51579
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Reviewed-by: Alex Deiter <alex.deiter@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>