implemented stats script 'raw' command
implemented stats script 'raw' command

This allows you to send arbitrary stats 'subcommand'. For example,
here's how to grab moxi stats: ./stats lh:12001 raw 'proxy buckets'

Change-Id: Ic41c80fc0f16b1e12de1c76aca0dea156783619a
Reviewed-on: http://review.membase.org/4574
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Reviewed-by: Dustin Sallings <1c08efb9b3965701be9d700d9a6f481f1ffec3ea@spy.net>

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