[issue27650] Implement `__repr__` methods for logging.Logger and others

[lilydjwg]

lilydjwg added the comment:

This hangs this test from celery: https://github.com/celery/celery/blob/master/t/unit/app/test_log.py#L72

It constructs a Logger with `.parent` to itself, making getEffectiveLevel loop forever. The code tries to raise an exception when such loops are detected, but its message contains the logger's repr which calls getEffectiveLevel.

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nosy: +lilydjwg

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<http://bugs.python.org/issue27650>
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