luci-app-mwan3: add globals config section

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

applications/luci-app-mwan3/luasrc/model/cbi/mwan/globalsconfig.lua

@@ -0,0 +1,32 @@
+--[[
+LuCI - Lua Configuration Interface
+
+Copyright 2017 Florian Eckert <fe@dev.tdt.de>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+$Id$
+]]--
+
+local net = require "luci.model.network".init()
+
+m = Map("mwan3")
+
+s = m:section(NamedSection, "globals", "globals", translate("Globals mwan3 options"))
+n = s:option(ListValue, "local_source",
+	translate("Local source interface"),
+	translate("Use the IP address of this interface as source IP address for traffic initiated by the router itself"))
+n:value("none")
+n.default = "none"
+for _, net in ipairs(net:get_networks()) do
+	if net:name() ~= "loopback" then
+		n:value(net:name())
+	end
+end
+n.rmempty = false
+
+return m