make a module for vlan

Acked-by: Daniel Barlow <<dan@telent.net>>

examples/arhcive.nix

@@ -31,6 +31,7 @@ in rec {
     ../modules/standard.nix
     ../modules/wlan.nix
     ../modules/network
+    ../modules/vlan
   ];
 
   hostname = "arhcive";