Add QoS firewall stop script generation

To prevent code duplication for clearing QoS firewall rules, support
"firewall stop" arguments to generate.sh to generate the necessary
script commands.  Make use of this from qos-stop.

Signed-off-by: Kevin Locke <klocke@digitalenginesoftware.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@28623 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/qos-scripts/files/usr/bin/qos-stop

@@ -3,5 +3,4 @@ for iface in $(tc qdisc show | grep -E '(hfsc|ingress)' | awk '{print $5}'); do
 	tc qdisc del dev "$iface" ingress 2>&- >&-
 	tc qdisc del dev "$iface" root 2>&- >&-
 done
-iptables -t mangle -F
-iptables -t mangle -X
+/usr/lib/qos/generate.sh firewall stop | sh

package/qos-scripts/files/usr/lib/qos/generate.sh

@@ -486,6 +486,13 @@ case "$1" in
 		start_interfaces
 	;;
 	firewall)
+		case "$2" in
+			stop)
+				stop_firewall
+			;;
+			start|"")
 				start_firewall
 			;;
+		esac
+	;;
 esac