firewall: Improve ubus support

* Use network.interface dump call instead of individual status calls
  to reduce overall netifd lookups and invokes to 1 per fw3 process.

* Allow protocol handlers to assign a firewall zone for an interface
  in the data section to allow for dynamic firewall zone assignment.

SVN-Revision: 38504

package/network/config/firewall/files/firewall.hotplug

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-[ "$ACTION" = ifup ] || exit 0
+[ "$ACTION" = ifup -o "$ACTION" = ifupdate ] || exit 0
 
 /etc/init.d/firewall enabled || exit 0