disable ra flag for several plugins (#2408)

* disable ra flag for several plugins

* removed unnecessary assignment

* removed more unnecessary assignments

plugin/etcd/handler.go

@@ -82,7 +82,7 @@ func (e *Etcd) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (
 
 	m := new(dns.Msg)
 	m.SetReply(r)
-	m.Authoritative, m.RecursionAvailable = true, true
+	m.Authoritative = true
 	m.Answer = append(m.Answer, records...)
 	m.Extra = append(m.Extra, extra...)
 

plugin/etcd/stub_handler.go

@@ -32,7 +32,6 @@ func (s Stub) ServeDNS(ctx context.Context, w dns.ResponseWriter, req *dns.Msg)
 	if e != nil {
 		return dns.RcodeServerFailure, e
 	}
-	m.RecursionAvailable = true
 	w.WriteMsg(m)
 	return dns.RcodeSuccess, nil
 }