gluon-radvd: run on local-node instead of br-client

On a layer 3 mesh, we'd like the default route to point to all node's
local-node interface for roaming to work.

package/gluon-radvd/files/etc/init.d/gluon-radvd

@@ -3,13 +3,14 @@
 USE_PROCD=1
 START=50
 
-start_service() {
-  [ -x /lib/gluon/radvd/arguments ] && {
-    procd_open_instance
-    procd_set_param command /usr/sbin/uradvd $(/lib/gluon/radvd/arguments)
-    procd_set_param respawn ${respawn_threshold:-3600} ${respawn_timeout:-5} ${respawn_retry:-5}
-    procd_set_param netdev br-client
-    procd_set_param stderr 1
-    procd_close_instance
-  }
+SERVICE_WRITE_PID=1
+SERVICE_DAEMONIZE=1
+
+
+start() {
+	service_start /usr/sbin/uradvd -i local-node -a $(lua -e 'print(require("gluon.site_config").prefix6)')
+}
+
+stop() {
+	service_stop /usr/sbin/uradvd
 }