MB-5749 Don't replace the current access log if a new log is empty
MB-5749 Don't replace the current access log if a new log is empty

Change-Id: I5fdbc3e208174ca0ab1a8a4c4d2122de4986fa67
Reviewed-on: http://review.couchbase.org/17819
Reviewed-by: Jin Lim <c45cd80a556f432a3607171a6818cd5a074b5cd4@couchbase.com>
Tested-by: Jin Lim <c45cd80a556f432a3607171a6818cd5a074b5cd4@couchbase.com>

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