images: netdev -- Adjust venet comment

venet is not virtuozzo specific but rather
came from openvz, make it so.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

images/netdev.proto

@@ -16,10 +16,7 @@ enum nd_type {
 	 * by the setup-namespaces script.
 	 */
 	EXTLINK		= 4;
-	/*
-	 * Virtuozzo specific device.
-	 */
-	VENET		= 5;
+	VENET		= 5; /* OpenVZ device */
 	BRIDGE		= 6;
 	MACVLAN		= 7;
 }