NCBC-669: Client incorrectly assumes 1024 vbuckets

Change-Id: I9528aa7f3fceb10ee97adcec51b6912cf7209a43
Reviewed-on: http://review.couchbase.org/41864
Tested-by: Jeffry Morris <jeffrymorris@gmail.com>
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>