Add get_bucket_names/1 to get only a particular bucket type
Add get_bucket_names/1 to get only a particular bucket type

Change-Id: I11952a84665cbc85bdfbad2b5ead2a3e3efb4d86
Reviewed-on: http://review.northscale.com/2215
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

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