disable udp echo/chargen by default; avoid DOS attacks

src/etc/inetd.conf

@@ -1,4 +1,4 @@
-#	$OpenBSD: inetd.conf,v 1.12 1996/09/22 08:43:04 tholo Exp $
+#	$OpenBSD: inetd.conf,v 1.13 1996/09/23 01:02:22 deraadt Exp $
 #
 # Internet server configuration database
 #
@@ -20,9 +20,9 @@ discard		stream	tcp	nowait	root	internal
 chargen		stream	tcp	nowait	root	internal
 daytime		stream	tcp	nowait	root	internal
 time		stream	tcp	nowait	root	internal
-echo		dgram	udp	wait	root	internal
+#echo		dgram	udp	wait	root	internal
 discard		dgram	udp	wait	root	internal
-chargen		dgram	udp	wait	root	internal
+#chargen	dgram	udp	wait	root	internal
 daytime		dgram	udp	wait	root	internal
 time		dgram	udp	wait	root	internal
 # Kerberos authenticated services