websocket.py:
* With echo.py, which doesn't need any server configuration, we can
just switch over our application class to inherit from
WebSocketRequestHandler instead of WebSocketServer. Also, need to
use the new method name new_websocket_client.
* With load.py, since we have the "delay" configuration, we need both
a server class and a request handler.
Note that for both tests, I've removed the raising of
self.EClose(closed). This is incorrect. First of all, it's described
as "An exception before the WebSocket connection was established", so
not suitable for our case. Second, it will cause send_close to be
called twice. Finally, self.EClose is now in the WebSocketServer
class, and not a member of the request handler.
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