Limit the additional processing for large RDATA sets

Limit the additional processing for large RDATA sets

When answering queries, don't add data to the additional section if
the answer has more than 13 names in the RDATA.  This limits the
number of lookups into the database(s) during a single client query,
reducing query processing load.

Also, don't append any additional data to type=ANY queries. The
answer to ANY is already big enough.

(cherry picked from commit a1982cf1bb95c818aa7b58988b5611dec80f2408)