[issue3602] Move test.test_suport.catch_warning() to the 'warnings' module

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

I think I can clean up the code by shifting WarningMessage over to a
subclass of namedtuple and moving WarningsRecorder over to a subclass of
list.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3602>
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