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

[Benjamin Peterson]

Benjamin Peterson <musiccomposition at gmail.com> added the comment:

I don't think the using argument should live in warnings; it's too test
specific. I recommend we still keep a catch_warning in test_support (or
even just test_warnings since this seems to be the only use-case).

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nosy: +benjamin.peterson

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<http://bugs.python.org/issue3602>
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