EDNS(1) queries (define DRAFT_ANDREWS_EDNS1 when
building). Add support for limiting the EDNS version
advertised to servers: server { edns-version 0; };
Log the EDNS version received in the query log.
[RT #35864]
any matching RRSIG records. A subsequent lookup of
of NO DATA cache entry could trigger a INSIST when the
unexpected RRSIG was also returned with the NO DATA
cache entry. [RT #22288]
