events server blocks app

Scenario:

1. Launch client
2. Kill it.
3. polkit-authentication-agent is left orphaned (it is launched if not found running)
4. Try to launch client again.
5. blocks.

samsara 戝 ~leapsrc ➤ 53056ee|feature/check_kext⚡
10809 ± : python app.py --debug  --danger                                                                                                                                             ⏎ [4h38m] ✹
^CTraceback (most recent call last):
  File "app.py", line 216, in 
    main()
  File "app.py", line 134, in main
    event_server.ensure_server(event_server.SERVER_PORT)
  File "/home/kali/Virtualenvs/leap-client/local/lib/python2.7/site-packages/leap.common-0.2.7-py2.7.egg/leap/common/events/server.py", line 80, in ensure_server
    response = ping(port)
  File "/home/kali/Virtualenvs/leap-client/local/lib/python2.7/site-packages/leap.common-0.2.7-py2.7.egg/leap/common/events/server.py", line 115, in ping
    return service.ping(request, callback=reqcbk, timeout=timeout)
  File "/home/kali/Virtualenvs/leap-client/local/lib/python2.7/site-packages/protobuf.socketrpc-1.3.2-py2.7.egg/protobuf/socketrpc/service.py", line 114, in 
    timeout, callback)
  File "/home/kali/Virtualenvs/leap-client/local/lib/python2.7/site-packages/protobuf.socketrpc-1.3.2-py2.7.egg/protobuf/socketrpc/service.py", line 194, in call
    rpc_thread.join(timeout)
  File "/usr/lib/python2.7/threading.py", line 958, in join
    self.__block.wait(delay)
  File "/usr/lib/python2.7/threading.py", line 358, in wait
    _sleep(delay)
KeyboardInterrupt
(leap-client)

(from redmine: created on 2013-07-26, closed on 2013-07-31, relates #3250 (closed))