leap.common.events tests take too long (and fail)

Version is currently: 0.3.1-14-g03e5e61

10813 ± : python setup.py test -s leap.common.tests.test_events                                                                                                                                                      ⏎ [3d20h20m]
running test
running egg_info
writing requirements to src/leap.common.egg-info/requires.txt
writing src/leap.common.egg-info/PKG-INFO
writing namespace_packages to src/leap.common.egg-info/namespace_packages.txt
writing top-level names to src/leap.common.egg-info/top_level.txt
writing dependency_links to src/leap.common.egg-info/dependency_links.txt
reading manifest file 'src/leap.common.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'src/leap.common.egg-info/SOURCES.txt'
running build_ext
test_async_ping_client (leap.common.tests.test_events.EventsTestCase) ... Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 808, in __bootstrap_inner
    self.run()
  File "/home/kali/leap/leap_common/src/leap/common/events/daemon.py", line 190, in run
    self._server.run()
  File "/home/kali/leap/leap_common/src/leap/common/events/daemon.py", line 69, in run
    SocketHandler, self)
  File "/home/kali/Virtualenvs/leap-bitmask/local/lib/python2.7/site-packages/protobuf.socketrpc-1.3.2-py2.7.egg/protobuf/socketrpc/server.py", line 237, in __init__
    self, server_address, RequestHandlerClass)
  File "/usr/lib/python2.7/SocketServer.py", line 419, in __init__
    self.server_bind()
  File "/usr/lib/python2.7/SocketServer.py", line 430, in server_bind
    self.socket.bind(self.server_address)
  File "/usr/lib/python2.7/socket.py", line 224, in meth
    return getattr(self._sock,name)(*args)
error: [Errno 98] Address already in use

ok
test_async_ping_server (leap.common.tests.test_events.EventsTestCase) ... FAIL
test_async_register (leap.common.tests.test_events.EventsTestCase) ... 

...

(from redmine: created on 2013-09-03, closed on 2013-09-03, relates #3515 (closed))