Soft-delete expired and undeleted items only through item pager.
Soft-delete expired and undeleted items only through item pager.

Change-Id: Idda9a2c69da3e09e11ca7c70379a977e332944ed
Reviewed-on: http://review.couchbase.org/12046
Reviewed-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>
Tested-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>

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