re-do shutdown operations. Run the scripts if we may; take down carp

unconditionally, and then do the optional powerdown
discussed at length with rpe

src/etc/rc

@@ -1,4 +1,4 @@
-#	$OpenBSD: rc,v 1.412 2013/12/27 04:21:48 deraadt Exp $
+#	$OpenBSD: rc,v 1.413 2013/12/27 22:15:40 deraadt Exp $
 
 # System startup script run by init on autoboot
 # or after single-user.
@@ -233,33 +233,33 @@ if [ X"$1" = X"shutdown" ]; then
 	dd if=/dev/random of=/var/db/host.random bs=65536 count=1 >/dev/null 2>&1
 	chmod 600 /var/db/host.random >/dev/null 2>&1
 	_c=$?
-	if [ ${_c} -eq 0 -a -n "${pkg_scripts}" ]; then
-		echo -n 'stopping package daemons:'
-		while [ -n "${pkg_scripts}" ]; do
-			_r=${pkg_scripts##* }
-			pkg_scripts=${pkg_scripts%%*( )${_r}}
-			[ -x /etc/rc.d/${_r} ] && /etc/rc.d/${_r} stop
-		done
-		echo '.'
-	fi
-	if [ ${_c} -eq 0 -a -f /etc/rc.shutdown ]; then
+	if [ ${_c} -eq 0 ]; then
+		if [ -n "${pkg_scripts}" ]; then
+			echo -n 'stopping package daemons:'
+			while [ -n "${pkg_scripts}" ]; do
+				_r=${pkg_scripts##* }
+				pkg_scripts=${pkg_scripts%%*( )${_r}}
+				[ -x /etc/rc.d/${_r} ] && /etc/rc.d/${_r} stop
+			done
+			echo '.'
+		fi
+
 		echo /etc/rc.shutdown in progress...
 		. /etc/rc.shutdown
 		echo /etc/rc.shutdown complete.
+	else
+		echo single user: not running shutdown scripts
+	fi
 
-		# bring carp interfaces down gracefully
-		ifconfig | while read a b; do
-			case $a in
-			carp+([0-9]):) ifconfig ${a%:} down ;;
-			esac
-		done
-
-		if [ X"${powerdown}" = X"YES" ]; then
-			exit 2
-		fi
+	# bring carp interfaces down gracefully
+	ifconfig | while read a b; do
+		case $a in
+		carp+([0-9]):) ifconfig ${a%:} down ;;
+		esac
+	done
 
-	else
-		echo single user: not running /etc/rc.shutdown
+	if [ X"${powerdown}" = X"YES" ]; then
+		exit 2
 	fi
 	exit 0
 fi