Skip the invalidate metadata stress test until the race in the catalog server is resolved.

Change-Id: I71911078d274f894f5a28c0e7123e5e5ac8dc940
Reviewed-on: http://gerrit.ent.cloudera.com:8080/1507
Reviewed-by: Lenni Kuff <lskuff@cloudera.com>
Tested-by: jenkins