implemented bucket_type getter for bucket config
implemented bucket_type getter for bucket config

Change-Id: Ife9a1976cf5e84540eed31061735f147d37003ef
Reviewed-on: http://review.northscale.com/1671
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

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