Optimized test runs for non-working cluster

Change-Id: I7d74deebda431bf6c7a4dda5aa3b94d91b7a886b
Reviewed-on: http://review.couchbase.org/24208
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>