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

[Roundup Robot]

Roundup Robot added the comment:

New changeset a9bbc2d0c1dc by Nick Coghlan in branch 'default':
Issue #19330: Handle the no-docstrings case in tests
http://hg.python.org/cpython/rev/a9bbc2d0c1dc

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19330>
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