LU-18323 tests: skip sanity/27T for OSTs < 2.15.65.18

LU-18323 tests: skip sanity/27T for OSTs < 2.15.65.18

Skip sanity test_27T for OSTs < 2.15.65.18 since the test depends on
changes made to the OST code on the server.

Test-Parameters: trivial testlist=sanity env=ONLY=27T serverversion=2.15.5

Change-Id: I96b134f3ade1d417adf751a69cdcfc71c15b4d75
Fixes: 8a865c65c6 ("LU-17567 tests: improve sanity.sh:test_27T")
Fixes: ccaff8d3c0 ("LU-17567 tests: skip sanity/27T for older OSTs")
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56615
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Sarah Liu <sarah@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>