Default to scrubbing replies in the server (#2012)

Every plugin needs to deal with EDNS0 and should call Scrub to make a
message fit the client's buffer. Move this functionality into the server
and wrapping the ResponseWriter into a ScrubWriter that handles these
bits for us. Result:

Less code and faster, because multiple chained plugins could all be
calling scrub and SizeAndDo - now there is just one place.

Most tests in file/* and dnssec/* needed adjusting because in those unit
tests you don't see OPT RRs anymore. The DNSSEC signer was also looking
at the returned OPT RR to see if it needed to sign - as those are now
added by the server (and thus later), this needed to change slightly.

Scrub itself still exist (for backward compat reasons), but has been
made a noop. Scrub has been renamed to scrub as it should not be used by
external plugins.

Fixes: #2010

Signed-off-by: Miek Gieben <miek@miek.nl>

request/writer.go

@@ -0,0 +1,20 @@
+package request
+
+import "github.com/miekg/dns"
+
+// ScrubWriter will, when writing the message, call scrub to make it fit the client's buffer.
+type ScrubWriter struct {
+	dns.ResponseWriter
+	req *dns.Msg // original request
+}
+
+// NewScrubWriter returns a new and initialized ScrubWriter.
+func NewScrubWriter(req *dns.Msg, w dns.ResponseWriter) *ScrubWriter { return &ScrubWriter{w, req} }
+
+// WriteMsg overrides the default implementation of the underlaying dns.ResponseWriter and calls
+// scrub on the message m and will then write it to the client.
+func (s *ScrubWriter) WriteMsg(m *dns.Msg) error {
+	state := Request{Req: s.req, W: s.ResponseWriter}
+	new, _ := state.Scrub(m)
+	return s.ResponseWriter.WriteMsg(new)
+}