implemented /pools/default/nodeServicesStreaming

This commit also replaces temporary nodeServices implementation with
proper implementation. Specifically, this implementation takes
advantage of bucket info cache so that high rate of requests can be
handled.

Change-Id: Ie504bcac57461be4a61782ad468fd8921d558d60
Reviewed-on: http://review.couchbase.org/44452
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>