[issue11557] Increase coverage in logging module

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset 0494afdc8615 by Vinay Sajip in branch 'default':
Attempt fix of #11557 by refining setup/teardown logic.
http://hg.python.org/cpython/rev/0494afdc8615

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