Fix OverflowError on Windows

Traceback (most recent call last):
  File "/opt/re6stnet/re6stnet", line 403, in main
    tunnel_manager.handlePeerEvent()
  File "/cygdrive/d/slapos/opt/git/re6stnet/re6st/tunnel.py", line 472, in handlePeerEvent
    self.sock.sendto('\1' + ''.join(msg), address)

re6st/tunnel.py

@@ -434,7 +434,7 @@ class TunnelManager(object):
                 msg.append(encode(self._peer_db.getPeerList().next()))
             if msg:
                 try:
-                    self.sock.sendto('\1' + ''.join(msg), address)
+                    self.sock.sendto('\1' + ''.join(msg), address[:2])
                 except socket.error, e:
                     logging.info('Failed to reply to %s (%s)', address, e)
         elif code == 255:
@@ -447,6 +447,6 @@ class TunnelManager(object):
                            for x in (self._connection_dict, self._served)
                            for x in x)
                 try:
-                    self.sock.sendto(''.join(msg), address)
+                    self.sock.sendto(''.join(msg), address[:2])
                 except socket.error, e:
                     pass