Use CouchbaseConfig instead of the incorrectly used DefaultConfig.

Change-Id: I2081ef6cf37b83c8a3cb9c7237b01ccafdcf58eb
Reviewed-on: http://review.couchbase.org/33788
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>