Avoid getting config lock on every unlinkCouchFile
Avoid getting config lock on every unlinkCouchFile

Change-Id: I7a5c3cf81a227ee2ddc02750839cc3b94359fe88
Reviewed-on: http://review.couchbase.org/41004
Reviewed-by: Sundararaman Sridharan <333a3f71d3ad6e01fc953c4fa06bc1f3cd014910@couchbase.com>
Tested-by: abhinav dangeti <d73ef2279de6577f7bf081737ee47554bbb7dc82@couchbase.com>

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