LU-15378 tests: skip sanity test_64h for old servers

LU-15378 tests: skip sanity test_64h for old servers

Running sanity test_64h fails intermittently with EXA5.2 servers,
skip it during interop since there are a number of fixes in this
area and EXA5 grant interop isn't super critical.

Lustre-change: https://review.whamcloud.com/54699
Lustre-commit: 351c3e4275025899c60d9aaed3687855479bf06b

Test-Parameters: trivial testlist=sanity env=ONLY=64 serverversion=EXA5
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I65d9e247aa62c02345c3cd0f9575e3e0ba1ff2ce
Reviewed-by: Sergey Cheremencev <scherementsev@ddn.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55462
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>