LU-16868 tests: skip conf-sanity/32 in interop

LU-16868 tests: skip conf-sanity/32 in interop

Do not run conf-sanity.sh test_32* in interop testing.  Otherwise,
it is possible that the version of the test script running on the
client does not perform the upgrades with the right steps needed
for remote servers that are running a different version.

Test-Parameters: trivial testlist=conf-sanity env=ONLY=32a
Test-Parameters: testlist=conf-sanity env=ONLY=32a serverversion=2.12.9
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Iabe1469a87d58c49e3c38b76ab18f8997f3ebbe5