Make echo.py and load.py work again, after the refactoring of

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.

tests/echo.py

@@ -12,15 +12,15 @@ as taken from http://docs.python.org/dev/library/ssl.html#certificates
 
 import os, sys, select, optparse
 sys.path.insert(0,os.path.dirname(__file__) + "/../websockify")
-from websocket import WebSocketServer
+from websocket import WebSocketServer, WebSocketRequestHandler
 
-class WebSocketEcho(WebSocketServer):
+class WebSocketEcho(WebSocketRequestHandler):
     """
     WebSockets server that echos back whatever is received from the
     client.  """
     buffer_size = 8096
 
-    def new_client(self):
+    def new_websocket_client(self):
         """
         Echo back whatever is received.
         """
@@ -49,7 +49,6 @@ class WebSocketEcho(WebSocketServer):
 
                 if closed:
                     self.send_close()
-                    raise self.EClose(closed)
 
 if __name__ == '__main__':
     parser = optparse.OptionParser(usage="%prog [options] listen_port")
@@ -70,6 +69,6 @@ if __name__ == '__main__':
         parser.error("Invalid arguments")
 
     opts.web = "."
-    server = WebSocketEcho(**opts.__dict__)
+    server = WebSocketServer(WebSocketEcho, **opts.__dict__)
     server.start_server()