Don't transition stream state when the backfill task completes
Don't transition stream state when the backfill task completes

Change-Id: Ic97bb65abe0014e8dfaa32828e5e6941fb9751a2
Reviewed-on: http://review.couchbase.org/34112
Reviewed-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>
Tested-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>

membase/ep-engine,hisundar/ep-engine,teligent-ru/ep-engine,sriganes/ep-engine,owendCB/ep-engine,sriganes/ep-engine,daverigby/ep-engine,teligent-ru/ep-engine,jimwwalker/ep-engine,daverigby/ep-engine,sriganes/ep-engine,owendCB/ep-engine,owendCB/ep-engine,hisundar/ep-engine,daverigby/kv_engine,jimwwalker/ep-engine,teligent-ru/ep-engine,sriganes/ep-engine,jimwwalker/ep-engine,hisundar/ep-engine,daverigby/ep-engine,couchbase/ep-engine,couchbase/ep-engine,couchbase/ep-engine,owendCB/ep-engine,hisundar/ep-engine,daverigby/kv_engine,jimwwalker/ep-engine,teligent-ru/ep-engine,daverigby/kv_engine,membase/ep-engine,membase/ep-engine,couchbase/ep-engine,daverigby/ep-engine,daverigby/kv_engine,membase/ep-engine