Add snapshotHisto details to stats.org
Add snapshotHisto details to stats.org

Change-Id: Ib4859a325479ec08ea5f533a6b347b045b10046b
Reviewed-on: http://review.couchbase.org/53094
Reviewed-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>
Tested-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>

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