[issue3270] test_multiprocessing: test_listener_client flakiness

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> This would mean raising an exception in Listener.__init__ if this 
> invariant is violated.

If I understand the suggestion correctly, it would forbid people to
listen on 0.0.0.0. I'm not sure it is the right correction for the
problem. Listening on 0.0.0.0 can be handy when you are not sure which
address to use; it would be better to address the problem elsewhere.

IMO, the "FQDN removal patch" as uploaded by Jesse is simple and
straight-forward enough, provided it does fix the bug.

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nosy: +pitrou

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