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Brad Warren authored
Fixes https://github.com/certbot/certbot/issues/8494. I left the `six` dependency pinned in `tests/letstest/requirements.txt` and `tools/oldest_constraints.txt` because `six` is still a transitive dependency with our current pinnings. The extra moving around of imports is due to me using `isort` to help me keep dependencies in sorted order after replacing imports of `six`. * remove some six usage in acme * remove six from acme * remove six.add_metaclass usage * fix six.moves.zip * fix six.moves.builtins.open * six.moves server fixes * 's/six\.moves\.range/range/g' * stop using six.moves.xrange * fix urllib imports * s/six\.binary_type/bytes/g * s/six\.string_types/str/g * 's/six\.text_type/str/g' * fix six.iteritems usage * fix itervalues usage * switch from six.StringIO to io.StringIO * remove six imports * misc fixes * stop using six.reload_module * no six.PY2 * rip out six * keep six pinned in oldest constraints * fix log_test.py * update changelog