Start a stats_collector per bucket.
Start a stats_collector per bucket.

Change-Id: I693951d55b741316cbf7bc2c0aa1be3f5024877b
Reviewed-on: http://review.northscale.com/1037
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

daverigby/ns_server,daverigby/ns_server,mschoch/ns_server,mschoch/ns_server,daverigby/ns_server,ceejatec/ns_server,mschoch/ns_server,nimishzynga/ns_server,t3rm1n4l/ns_server,pavel-blagodov/ns_server,membase/ns_server,ingenthr/ns_server,membase/ns_server,mschoch/ns_server,ingenthr/ns_server,mschoch/ns_server,ceejatec/ns_server,membase/ns_server,mschoch/ns_server,ceejatec/ns_server,ceejatec/ns_server,vzasade/ns_server,pavel-blagodov/ns_server,membase/ns_server,ceejatec/ns_server,ingenthr/ns_server,t3rm1n4l/ns_server,t3rm1n4l/ns_server,pavel-blagodov/ns_server,membase/ns_server,t3rm1n4l/ns_server,nimishzynga/ns_server,pavel-blagodov/ns_server,t3rm1n4l/ns_server,vzasade/ns_server,vzasade/ns_server,ceejatec/ns_server,daverigby/ns_server,nimishzynga/ns_server,daverigby/ns_server,vzasade/ns_server,nimishzynga/ns_server,membase/ns_server,ingenthr/ns_server,nimishzynga/ns_server,nimishzynga/ns_server