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: Ic2d4c9d0c4d9fb6045583dd6ed05eb273e876f7f
Reviewed-on: http://review.couchbase.org/35979
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>