MB-8798 Remove dead conns by iterating the conn list one time.
MB-8798 Remove dead conns by iterating the conn list one time.

Change-Id: I04a9e64462391b7b93249828d1ecbef3dfd60175
Reviewed-on: http://review.couchbase.org/28107
Reviewed-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>
Tested-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>

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