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

[Nick Coghlan]

Nick Coghlan added the comment:

I decided to defer adding any public attributes to these APIs - that greatly simplifies this patch, is more consistent with the draft wording in the PEP 8 update (issue 19331), and if the demand for improved introspection support is there, we can always add them for 3.5.

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