Switch away from iteration shims.

Review Request #11850 — Created Oct. 14, 2021 and submitted — Latest diff uploaded

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master

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In the Python 2 to 3 conversion, many iteration methods (such as
items() and keys() were changed from returning lists to iterators.
In order to be correct in usage everywhere, we used six to ensure
consistent behavior across versions. Now that we're Python 3+ only on
the master branch, we can get rid of these and just use the builtins.

Ran unit tests.

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