This should following random errors:

>   File "neo/lib/event.py", line 77, in unregister
>     self.epoll.unregister(fd)
> IOError: [Errno 2] No such file or directory

>   File "neo/tests/threaded/test.py", line 670, in testClientReconnection
>     c, = cluster.storage.nm.getClientList()
> ValueError: need more than 0 values to unpack