crash on shutdown

[ndbecker]

xpra-0.8.0-9.fc18.x86_64
winswitch-0.12.18-2.x86_64

applet.py:751:do_stop_server:AttributeError: ServerLineConnection instance has no attribute 'stop_server'

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/winswitch/ui/dialog_util.py", line 119, in <lambda>
    dialog.connect('response', lambda dialog, response_id: ask_response_callback(dialog, response_id))
  File "/usr/lib/python2.7/site-packages/winswitch/ui/dialog_util.py", line 105, in ask_response_callback
    ok_callback()
  File "/usr/lib/python2.7/site-packages/winswitch/client/applet.py", line 746, in <lambda>
    None, lambda: self.do_stop_server(server))
  File "/usr/lib/python2.7/site-packages/winswitch/client/applet.py", line 751, in do_stop_server
    client.stop_server("User request")
AttributeError: ServerLineConnection instance has no attribute 'stop_server'

Local variables in innermost frame:
self: <winswitch.client.applet.WinSwitchApplet instance at 0x7ff10efdda70>
client: <winswitch.client.server_line_connection.ServerLineConnection instance at 0x25e1950>
server: <winswitch.objects.server_config.ServerConfig instance at 0x25eb638>

[Antoine Martin]

As per ​this ML post, the fix is in r5136