Cleanup and consolidate MPSystemComponent and add StopListening to AzNetworking

Code/Framework/AzNetworking/AzNetworking/Framework/INetworkInterface.h

@@ -88,6 +88,11 @@ namespace AzNetworking
         //! @return boolean true if the packet is confirmed acknowledged, false if the packet number is out of range, lost, or still pending acknowledgment
         virtual bool WasPacketAcked(ConnectionId connectionId, PacketId packetId) = 0;
 
+        //! Closes the network interface to stop accepting new incoming connections.
+        //! @param port the listen port number this network interface will potentially bind to, 0 if it's a don't care
+        //! @return boolean true if the operation was successful, false if it failed
+        virtual bool StopListening() = 0;
+
         //! Disconnects the specified connection.
         //! @param connectionId identifier of the connection to terminate
         //! @param reason      reason for the disconnect

Code/Framework/AzNetworking/AzNetworking/TcpTransport/TcpNetworkInterface.cpp

@@ -162,6 +162,12 @@ namespace AzNetworking
         return connection->WasPacketAcked(packetId);
     }
 
+    bool TcpNetworkInterface::StopListening()
+    {
+        m_port = 0;
+        return m_listenThread.StopListening(*this);
+    }
+
     bool TcpNetworkInterface::Disconnect(ConnectionId connectionId, DisconnectReason reason)
     {
         IConnection* connection = m_connectionSet.GetConnection(connectionId);

Code/Framework/AzNetworking/AzNetworking/TcpTransport/TcpNetworkInterface.h

@@ -63,6 +63,7 @@ namespace AzNetworking
         bool SendReliablePacket(ConnectionId connectionId, const IPacket& packet) override;
         PacketId SendUnreliablePacket(ConnectionId connectionId, const IPacket& packet) override;
         bool WasPacketAcked(ConnectionId connectionId, PacketId packetId) override;
+        bool StopListening() override;
         bool Disconnect(ConnectionId connectionId, DisconnectReason reason) override;
         //! @}
 

Code/Framework/AzNetworking/AzNetworking/UdpTransport/UdpNetworkInterface.cpp

@@ -359,6 +359,21 @@ namespace AzNetworking
         return connection->WasPacketAcked(packetId);
     }
 
+    bool UdpNetworkInterface::StopListening()
+    {
+        if (!m_socket->IsOpen())
+        {
+            AZ_Assert(false, "StopListen cannot be invoked on an already closed network interface");
+            return false;
+        }
+
+        m_port = 0;
+        m_readerThread.UnregisterSocket(m_socket.get());
+        m_allowIncomingConnections = false;
+        m_socket->Close();
+        return true;
+    }
+
     bool UdpNetworkInterface::Disconnect(ConnectionId connectionId, DisconnectReason reason)
     {
         IConnection* connection = m_connectionSet.GetConnection(connectionId);

Code/Framework/AzNetworking/AzNetworking/UdpTransport/UdpNetworkInterface.h

@@ -60,6 +60,7 @@ namespace AzNetworking
         bool SendReliablePacket(ConnectionId connectionId, const IPacket& packet) override;
         PacketId SendUnreliablePacket(ConnectionId connectionId, const IPacket& packet) override;
         bool WasPacketAcked(ConnectionId connectionId, PacketId packetId) override;
+        bool StopListening() override;
         bool Disconnect(ConnectionId connectionId, DisconnectReason reason) override;
         //! @}