[issue21724] resetwarnings doesn't reset warnings registry

[Berker Peksag]

Berker Peksag added the comment:

> It makes it difficult to get repeatable warning messages, e.g. at the > command prompt, because the shortcut path will silence messages which > were already emitted, even if the filter have been changed to "always" > in-between.

This could be related to issue 4180.

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nosy: +berker.peksag

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<http://bugs.python.org/issue21724>
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