edns0 compliance: set correct RCODE (#2388)
edns0 compliance: set correct RCODE (#2388)

The miekg/dns API is a bit scruffy (documentation PR in flight soon),
but these both need to be set for the correct RCODE to be reflected in
the returned packet.

Signed-off-by: Miek Gieben <00b357f94cf3a1145a32703fb42e2d80418ab806@miek.nl>
miekg/coredns,johnbelamaric/coredns,miekg/coredns,yongtang/coredns,ii/coredns,chrisohaver/coredns,coredns/coredns,ii/coredns,johnbelamaric/coredns