MB-5695 Data and queue age histogram is maintained in micro-second
MB-5695 Data and queue age histogram is maintained in micro-second

Change-Id: I6e433d6c0045b3ccbdd8fe28ad373ffe329c1c84
Reviewed-on: http://review.couchbase.org/17635
Reviewed-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>
Reviewed-by: Jin Lim <c45cd80a556f432a3607171a6818cd5a074b5cd4@couchbase.com>
Tested-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>

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