MB-7355: Remove the locked value from meta data
MB-7355: Remove the locked value from meta data

We can just set the lock_expiry to 0 when the item is unlocked.

Change-Id: Icf041e0ec85f2c296c59fbe09e680c0d41bba6dd
Reviewed-on: http://review.couchbase.org/23428
Reviewed-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>
Tested-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>

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