Revert "Reply on server port if request is a relay"

This reverts commit 2bf829493e241e08403b5fd464141c5d126f5056.

Signed-off-by: Anatole Denis <anatole@unverle.fr>

coredhcp.go

@@ -160,14 +160,7 @@ func (s *Server) MainHandler6(conn net.PacketConn, peer net.Addr, req dhcpv6.DHC
 		resp = tmp
 	}
 
-	var newPeer = peer
-	if req.IsRelay() {
-		newPeer = &net.UDPAddr{
-			IP:   peer.(*net.UDPAddr).IP,
-			Port: dhcpv6.DefaultServerPort,
-		}
-	}
-	if _, err := conn.WriteTo(resp.ToBytes(), newPeer); err != nil {
+	if _, err := conn.WriteTo(resp.ToBytes(), peer); err != nil {
 		log.Printf("MainHandler6: conn.Write to %v failed: %v", peer, err)
 	}
 }