gluon-core: add vxlan option to gluon_wired proto

Before this commit the decision whether a vxlan layer will be
introduced between the lower interface before the interface is
added to batman was inside the proto. Now the decision is moved
to the user of the proto.

package/gluon-core/files/lib/netifd/proto/gluon_wired.sh

@@ -7,6 +7,7 @@ init_proto "$@"
 proto_gluon_wired_init_config() {
         proto_config_add_boolean transitive
         proto_config_add_int index
+        proto_config_add_boolean vxlan
 }
 
 xor2() {
@@ -28,15 +29,16 @@ proto_gluon_wired_setup() {
 
         local meshif="$config"
 
-        local vxlan="$(lua -e 'print(require("gluon.site").mesh.vxlan(true))')"
+        local transitive index vxlan
+        json_get_vars transitive index vxlan
 
-        local transitive index
-        json_get_vars transitive index
+        # default args
+        [ -z "$vxlan" ] && vxlan=1
 
         proto_init_update "$ifname" 1
         proto_send_update "$config"
 
-        if [ "$vxlan" = 'true' ]; then
+        if [ "$vxlan" -eq 1 ]; then
                 meshif="vx_$config"
 
                 json_init

package/gluon-core/luasrc/lib/gluon/upgrade/210-interface-wan

@@ -7,6 +7,7 @@ uci:section('network', 'interface', 'mesh_wan', {
 	ifname = 'br-wan',
 	proto  = 'gluon_wired',
 	index  = 0,
+	vxlan  = site.mesh.vxlan(true),
 })
 
 local enable = site.mesh_on_wan(false)

package/gluon-core/luasrc/lib/gluon/upgrade/220-interface-lan

@@ -15,6 +15,7 @@ uci:section('network', 'interface', 'mesh_lan', {
 	igmp_snooping = false,
 	proto         = 'gluon_wired',
 	index         = 4,
+	vxlan         = site.mesh.vxlan(true),
 })
 
 if sysconfig.lan_ifname:match(' ') then