[REVIEW]: add multicast NULL route

On a system without a default route, multicast simply doesn't work.

This patch adds a route into lo0 for the entire multicast space.

A similar route were created in /etc/netstart until version 1.32
where it was moved to sysconfig (1.14) where the incorrect resolution
to conf/1007 commented it out in (1.36) and subsequently it was
lost in the conversion to new rc world ordering.

As a stylistic feature of this patch, we no longer encroach on the
administrators namespace by prepending a couple of "__" on the
internal magic routes.

Review and comments please.

Index: routing
===================================================================
RCS file: /home/ncvs/src/etc/rc.d/routing,v
retrieving revision 1.143
diff -u -r1.143 routing
--- routing	2 May 2007 15:49:30 -0000	1.143
+++ routing	15 Jun 2007 22:03:59 -0000
_at__at_ -31,12 +31,17 _at__at_
 
 static_start()
 {
+	# The multicast range must be covered by a route, one way or another
+	# or multicast will simply not work.
+	static_routes="__mcast ${static_routes}"
+	route___mcast="-static -net 224.0.0.0/4 -interface lo0"
+
 	case ${defaultrouter} in
 	[Nn][Oo] | '')
 		;;
 	*)
-		static_routes="default ${static_routes}"
-		route_default="default ${defaultrouter}"
+		static_routes="__default ${static_routes}"
+		route___default="__default ${defaultrouter}"
 		;;
 	esac
 
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