Revert "MB-5092 Don't drop items from dead vbucket checkpoints."
Revert "MB-5092 Don't drop items from dead vbucket checkpoints."

This reverts commit c4b6c48de4668b4334971612e122955eb283a320.

Change-Id: Ibe30f4b4125e1db0ec32e5e3a57b81fc2787a2b9
Reviewed-on: http://review.couchbase.org/15476
Reviewed-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>
Tested-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>

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