Fixed websocket test.

Previous error:

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    ERROR: test_websocket_network_timeout (tornado.test.websocket_test.WebSocketTest)
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    Traceback (most recent call last):
      File "C:\Users\schlaich\Documents\GitHub\tornado\.tox\py27\lib\site-packages\tornado\testing.py", line 118, in __call__
        result = self.orig_method()
      File "C:\Users\schlaich\Documents\GitHub\tornado\.tox\py27\lib\site-packages\tornado\testing.py", line 488, in post_coroutine
        functools.partial(coro, self), timeout=timeout)
      File "C:\Users\schlaich\Documents\GitHub\tornado\.tox\py27\lib\site-packages\tornado\ioloop.py", line 418, in run_sync

        return future_cell[0].result()
      File "C:\Users\schlaich\Documents\GitHub\tornado\.tox\py27\lib\site-packages\tornado\concurrent.py", line 109, in result
        raise_exc_info(self._exc_info)
      File "C:\Users\schlaich\Documents\GitHub\tornado\.tox\py27\lib\site-packages\tornado\gen.py", line 585, in run
        yielded = self.gen.throw(*sys.exc_info())
      File "C:\Users\schlaich\Documents\GitHub\tornado\.tox\py27\lib\site-packages\tornado\test\websocket_test.py", line 122, in test_websocket_network_timeout
        connect_timeout=0.01)
      File "C:\Users\schlaich\Documents\GitHub\tornado\.tox\py27\lib\site-packages\tornado\gen.py", line 582, in run
        value = future.result()
      File "C:\Users\schlaich\Documents\GitHub\tornado\.tox\py27\lib\site-packages\tornado\concurrent.py", line 111, in result
        raise self._exception
    HTTPError: HTTP 599: Timeout

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