don't add NS records to the authority section if they're already in the answer section.
don't add NS records to the authority section if they're already in the
answer section.


git-svn-id: fcb33a7ee5ec38b96370833547f088a4e742b712@574 c76caeb1-94fd-44dd-870f-0c9d92034fc1

justinsb/dnsjava