EX-9452 tests: skip sanity-pcc pccro=1 tests

EX-9452 tests: skip sanity-pcc pccro=1 tests

Skip subtests when running interop on MDS without PCC-RO support.
Avoid specifying "pccrw=1" for older systems without this parameter.

Fixes: 69594ef7cd ("EX-4006 pcc: make 'pccro=1' default")
Test-Parameters: trivial testlist=sanity-pcc
Test-Parameters: testlist=sanity-pcc serverversion=2.15
Test-Parameters: testlist=sanity-pcc serverbuildno=4512 serverjob=lustre-master serverdistro=el8.9
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I3915ce001cf1ca821d62ba18798d8132a3909a57
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/54541
Tested-by: jenkins <devops@whamcloud.com>