network: Add NetDeviceQueue methods to implement flow control

src/network/utils/net-device-queue-interface.cc

@@ -145,6 +145,12 @@ NetDeviceQueue::GetQueueLimits ()
   return m_queueLimits;
 }
 
+void
+NetDeviceQueue::DoNsLog (const enum LogLevel level, std::string str)
+{
+    NS_LOG (level, str);
+}
+
 
 NS_OBJECT_ENSURE_REGISTERED (NetDeviceQueueInterface);