Added reset to CLI stats tool.
Added reset to CLI stats tool.

Change-Id: If88556be9aee6a4dce2ebb6755da92405bcfb993
Reviewed-on: http://review.northscale.com/3114
Reviewed-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>
Tested-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>

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