[issue19330] Use public classes for contextlib.suppress and redirect_stdout

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I suppose tests will fail when Python is compiled with --without-doc-strings options. Perhaps the test.support.requires_docstrings decorator should be used.

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue19330>
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