don't monopolize "stats proxy" namespace
don't monopolize "stats proxy" namespace

Use "proxy" "buckets" sub-subcommand to grab per-bucket stats.

Change-Id: I968588c8bdfd50a0b2d91ce1ffd6181a3370e2cc
Reviewed-on: http://review.membase.org/4494
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

membase/moxi,couchbase/moxi,zbase/moxi,couchbase/moxi,zbase/moxi,zbase/moxi,membase/moxi,membase/moxi,couchbase/moxi,membase/moxi,membase/moxi,couchbase/moxi,couchbase/moxi,couchbase/moxi,zbase/moxi,zbase/moxi,membase/moxi