luci-app-firewall: restart firewall on /etc/firewall.user write

Signed-off-by: Florian Eckert <Eckert.Florian@googlemail.com>

applications/luci-app-firewall/luasrc/model/cbi/firewall/custom.lua

@@ -22,6 +22,10 @@ end
 function o.write(self, section, value)
 	value = value:gsub("\r\n?", "\n")
 	fs.writefile("/etc/firewall.user", value)
+	require("luci.sys").call("/etc/init.d/firewall restart >/dev/null 2<&1")
+	require("nixio").syslog('info', 'Restarting firewall on custom /etc/firewall.user change')
 end
 
+f.submit = translate("Restart Firewall")
+
 return f