Remove unused optional parameter to ThreadLocal
Remove unused optional parameter to ThreadLocal

Change-Id: I8f1dd362de01bd7ca7baa76326cb61beec3f534c
Reviewed-on: http://review.couchbase.org/31328
Reviewed-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>
Tested-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>

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