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>

SVN-Revision: 28623

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

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