Sometimes the epoll reactor raises ConnectError
Sometimes the epoll reactor raises ConnectError

Connection refused errors sometimes show up as a ConnectionLost error
that is then wrapped up in a Failure and then wrapped up in a
ConnectError. Bleh, and at this point they appear to already be
stringified so I cannot unwrap the original error.

marineam/nagcat,marineam/nagcat,marineam/nagcat