[issue28428] Rename _futures module to _asyncio

[INADA Naoki]

INADA Naoki added the comment:

Since this patch renames file, I used --git option of hg diff.
But Rietvelt seems doesn't accept git format patch.

Attached patch is same to previous, but generated without --git option.

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Added file: http://bugs.python.org/file45076/asyncio-speedups2.patch

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