MB-22179: ep_testsuite: allow ep_persist_vbstate_total to be >= 1
MB-22179: ep_testsuite: allow ep_persist_vbstate_total to be >= 1

When waiting for a vBucket's state to be persisted to disk; permit
ep_persist_vbstate_total to be one or higher (sometimes we get more
than one)

Change-Id: Ibb7fc2b059e3bc0cee5444bf2e4390d30adb35f2
Reviewed-on: http://review.couchbase.org/71551
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

couchbase/ep-engine,membase/ep-engine,daverigby/kv_engine,membase/ep-engine,daverigby/ep-engine,membase/ep-engine,daverigby/ep-engine,daverigby/kv_engine,daverigby/ep-engine,daverigby/kv_engine,membase/ep-engine,daverigby/kv_engine,couchbase/ep-engine,daverigby/ep-engine,couchbase/ep-engine,couchbase/ep-engine