Remove hybi sub directory for WebSocket layout tests

LayoutTests/http/tests/websocket/pong_wsh.py

 from mod_pywebsocket import common
 from mod_pywebsocket import msgutil
 
 
 def web_socket_do_extra_handshake(request):
     pass
 
 
 def web_socket_transfer_data(request):
     msgutil.send_ping(request, 'Hello, world!')
 
     # We need to use an internal function to detect a pong frame from the client.
     opcode, payload, final, reserved1, reserved2, reserved3 = request.ws_stream._receive_frame()
     if opcode == common.OPCODE_PONG and payload == 'Hello, world!' and final and not reserved1 and not reserved2 and not reserved3:
         msgutil.send_message(request, 'PASS')
     else:
         msgutil.send_message(request,
                              'FAIL: Received unexpected frame: opcode = %r, payload = %r, final = %r, reserved1 = %r, reserved2 = %r, reserved3 = %r' %
                              (opcode, payload, final, reserved1, reserved2, reserved3))