Don't run flusher initialization more than once.
Don't run flusher initialization more than once.

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