Add a dummy network that discards all packets.

Bug: 19500693
Change-Id: Ic25f2d8c481f1528e887e43ca3fa868189582110
diff --git a/server/NetworkController.h b/server/NetworkController.h
index 5596f0c..073745d 100644
--- a/server/NetworkController.h
+++ b/server/NetworkController.h
@@ -43,6 +43,7 @@
     static const unsigned MIN_OEM_ID;
     static const unsigned MAX_OEM_ID;
     static const unsigned LOCAL_NET_ID;
+    static const unsigned DUMMY_NET_ID;
 
     NetworkController();