Revert "MB-7597: adjust the changes for high CPU usage."
Revert "MB-7597: adjust the changes for high CPU usage."

This reverts commit eee2e9564ef844cf8cc435911d9e80af0dece244.

Change-Id: Ib30942fbde5287f903e8e7a38877380d7e1511ea
Reviewed-on: http://review.couchbase.org/24902
Reviewed-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>
Tested-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>

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