[issue28428] Rename _futures module to _asyncio

[INADA Naoki]

INADA Naoki added the comment:

Can I commit this patch without NEWS entry?
Only notable change is module name, but I don't expect no one import
it directly.

If it is required, it would be like:

- Issue #28428: Rename _futures module to _asyncio. It will have more
  speedup functions or classes other than asyncio.Future.

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<http://bugs.python.org/issue28428>
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