[issue21762] update the import machinery to only use __spec__

[Brett Cannon]

Brett Cannon added the comment:

Yeah, which is why it will take a transition to get people to start mucking with __spec__ instead of the module attributes for their legitimate/questionable needs (although the whole `__name__ == '__main__'` idiom means __name__ will never go away while __path__, __package__, __loader__, __file__, and __cached__ could all slowly go away).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21762>
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