Remove obsolete __future__ imports.

Review Request #11851 — Created Oct. 14, 2021 and submitted — Latest diff uploaded

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master

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Now that we're Python 3 only, we can remove all of the __future__
imports that we had added for compatibility. This change is mechanical
but quite large. It's been split up into individual commits for each
module for ease of review.

Ran unit tests.

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