MB-11454: Add an option to output json in cbstats
MB-11454: Add an option to output json in cbstats

Change-Id: I0adcb16adde82ddf3671e4edc0118061d684f2d4
Reviewed-on: http://review.couchbase.org/42084
Reviewed-by: abhinav dangeti <d73ef2279de6577f7bf081737ee47554bbb7dc82@couchbase.com>
Tested-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>

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