NCBC-658: Fix bug where /pools is not added to bootstrap urls when configuration is app.config

Change-Id: Ifd729cfbca8f3c0d20674312175b5e22cc70a2c1
Reviewed-on: http://review.couchbase.org/41737
Tested-by: Jeffry Morris <jeffrymorris@gmail.com>
Reviewed-by: Brett Lawson <brett19@gmail.com>