Clean up Flusher constructor.
Clean up Flusher constructor.

Change-Id: I187ee1fdf21376b6ac1586d3df784f3f281ac28c
Reviewed-on: https://review.northscale.com:8443/1317
Tested-by: Dustin Sallings <1c08efb9b3965701be9d700d9a6f481f1ffec3ea@spy.net>
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

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