remove UDP port number from thread names for better thread dump anonymity

router/java/src/net/i2p/router/transport/udp/PacketHandler.java

@@ -82,7 +82,7 @@ public class PacketHandler {
     public void startup() { 
         _keepReading = true;
         for (int i = 0; i < _handlers.size(); i++) {
-            I2PThread t = new I2PThread((Handler)_handlers.get(i), "Packet handler " + i + ": " + _endpoint.getListenPort());
+            I2PThread t = new I2PThread((Handler)_handlers.get(i), "UDP Packet handler " + i + "/" + _handlers.size());
             t.setDaemon(true);
             t.start();
         }

router/java/src/net/i2p/router/transport/udp/UDPEndpoint.java

@@ -39,8 +39,8 @@ public class UDPEndpoint {
                 _socket = new DatagramSocket(_listenPort);
             else
                 _socket = new DatagramSocket(_listenPort, _bindAddress);
-            _sender = new UDPSender(_context, _socket, "UDPSend on " + _listenPort);
-            _receiver = new UDPReceiver(_context, _transport, _socket, "UDPReceive on " + _listenPort);
+            _sender = new UDPSender(_context, _socket, "UDPSender");
+            _receiver = new UDPReceiver(_context, _transport, _socket, "UDPReceiver");
             _sender.startup();
             _receiver.startup();
         } catch (SocketException se) {