Don't try to stop a stopping dispatcher.
Don't try to stop a stopping dispatcher.

Change-Id: Idf53c2fa7cefcddabc02e82fee3e488537c67f0a
Reviewed-on: http://review.northscale.com:8080/230
Reviewed-by: Sean Lynch <9c3328a4a1f4f8f5c18b2d5b9057163c49b93ff3@literati.org>
Tested-by: Sean Lynch <9c3328a4a1f4f8f5c18b2d5b9057163c49b93ff3@literati.org>

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