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

[Brett Cannon]

Brett Cannon added the comment:

* Yes, you can commit with the warnings being triggered to get help with resolving them, just expect to potentially do a lot of work to make sure they don't leak out into 3.4 final.

* Just don't deprecate load_module() yet in code. If we can't even get rid of all our usage of the method then it isn't fair to expect users to do the same. Deprecating in the docs is fine, though.

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