MB-8214 remove unnecessary mutex notification
MB-8214 remove unnecessary mutex notification

ExecutorThread::reschedule() method gets called very
often. This does not need to call mutex notification
at all since the running thread itself calls the method
during its runtime.

Change-Id: I66b0fe60c82c604d173fdab8090bd7461fe2cece
Reviewed-on: http://review.couchbase.org/26721
Reviewed-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>
Tested-by: Jin Lim <c45cd80a556f432a3607171a6818cd5a074b5cd4@couchbase.com>

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