[issue7849] Improve "test_support.check_warnings()"

[Florent Xicluna]

Florent Xicluna <laxyf at yahoo.fr> added the comment:

Actually this patch enhances check_warnings() in other ways too:
 - it verifies if the warning is effectively raised
 - it deals with "py3k" warnings separately

It could be used instead of warnings.filterwarnings() with some benefits.

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<http://bugs.python.org/issue7849>
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