[issue21583] use support.captured_stderr context manager - test_logging

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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nosy: +vinay.sajip
stage:  -> patch review
title: use support.catpured_stderr context manager - test_logging -> use support.captured_stderr context manager - test_logging
type:  -> enhancement

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21583>
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