o stop reordering ifconfig arguments (e.g. after 'up ..')

o only stop processing if inet or inet6 lines are malformed
o everything not a specially handled bit is passed to ifconfig unmangled
noticed by several after the move from bridgename.bridge0 -> hostname.bridge0
prodded by deraadt@, tested by and feedback from several
man page bits 'look fine' jmc@

src/etc/netstart

@@ -1,6 +1,6 @@
 #!/bin/sh -
 #
-#	$OpenBSD: netstart,v 1.127 2009/11/22 23:09:50 deraadt Exp $
+#	$OpenBSD: netstart,v 1.128 2009/12/10 00:51:55 todd Exp $
 
 # Strip comments (and leading/trailing whitespace if IFS is set)
 # from a file and spew to stdout
@@ -93,11 +93,6 @@ ifstart() {
 			rtsolif="$rtsolif $if"
 			cmd="ifconfig $if $name $mask $bcaddr $ext1 $ext2 up"
 			;;
-		"up")
-			# The only one of these guaranteed to be set is $if.
-			# The remaining ones exist so that media controls work.
-			cmd="ifconfig $if $name $mask $bcaddr $ext1 $ext2 up"
-			;;
 		*)
 			read dt dtaddr
 			if [ "$name"  = "alias" ]; then
@@ -120,19 +115,24 @@ ifstart() {
 				cmd2="$dt $dtaddr"
 				;;
 			esac
-			if [ ! -n "$name" ]; then
-				echo "/etc/hostname.$if: invalid network configuration file"
-				return
-			fi
 			case $af in
 			inet)
+				if [ ! -n "$name" ]; then
+					echo "/etc/hostname.$if: inet alone is invalid"
+					return
+				fi
 				[ "$mask" ] && cmd="$cmd netmask $mask"
 				if [ "$bcaddr" -a "X$bcaddr" != "XNONE" ]; then
 					cmd="$cmd broadcast $bcaddr"
 				fi
 				[ "$alias" ] && rtcmd=";route -qn add -host $name 127.0.0.1"
 				;;
-			inet6) [ "$mask" ] && cmd="$cmd prefixlen $mask"
+			inet6)
+				if [ ! -n "$name" ]; then
+					echo "/etc/hostname.$if: inet6 alone is invalid"
+					return
+				fi
+				[ "$mask" ] && cmd="$cmd prefixlen $mask"
 				cmd="$cmd $bcaddr"
 				;;
 			*)