Fix copy constructor for iterator
Fix copy constructor for iterator

Change-Id: Idaeff725cbac46159b1179216831c4996f1391f5
Reviewed-on: http://review.couchbase.org/13684
Tested-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>
Reviewed-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>

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