[issue19713] Deprecate various things in importlib thanks to PEP 451

[Roundup Robot]

Roundup Robot added the comment:

New changeset 37caaf21f827 by Eric Snow in branch 'default':
Issue 19713: Add PEP 451-related deprecations.
http://hg.python.org/cpython/rev/37caaf21f827

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<http://bugs.python.org/issue19713>
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