[issue12167] test_packaging reference leak

[Antoine Pitrou]

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

> See http://hg.python.org/cpython/file/tip/Lib/packaging/tests/support.py#l81

AFAIU, the problem is that 2to3 creates a whole new logger for each
different file. So it's not about cleaning the handlers, but cleaning up
the loggers as well. And logging (deliberately, according to Vinay)
doesn't provide any API to destroy loggers (they are de facto eternal).

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