Implement rebroadcast mode NONE (#5040)

* Implement rebroadcast mode none

* Correct debug message

src/mesh/FloodingRouter.h

@@ -29,6 +29,8 @@
 class FloodingRouter : public Router, protected PacketHistory
 {
   private:
+    bool isRebroadcaster();
+
   public:
     /**
      * Constructor