Backfill tap queue in a thread.
Backfill tap queue in a thread.

Change-Id: Ib02366f6d596fa70d6502c059937582a811cc2e5
Reviewed-on: http://review.northscale.com:8080/33
Tested-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

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