CCBC-371/CCBC-368: Bail on bootstrap when the bucket is potentially missing

This will abort the current provider iteration on the list of hosts if
an authentication or HTTP 404 error is encountered _AND_ there is no
prior configuration

Change-Id: Id526ced7e73491a847323849f270cfb688cc8819
Reviewed-on: http://review.couchbase.org/36399
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>