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
* Remove python_version from mypy.ini.
* Fix magic_typing
* Ignore msvcrt usage.
* make mypy happier
* clean up changes
* Add type for reporter queue
* More mypy fixes
* Fix pyrfc3339 str.
* Remove unused import.
* Make certbot.util mypy work in both Pythons
* Fix typo
As pylint is evolving, it improves its accuracy, and several pylint error suppression (`# pylint: disable=ERROR) added in certbot codebase months or years ago are not needed anymore to make it happy.
There is a (disabled by default) pylint error to detect the useless suppressions (pylint-ception: `useless-suppression`). It is not working perfectly (it has also false-positives ...) but it is a good start to clean the codebase.
This PR removes several of these useless suppressions as detected by the current pylint version we use.
* Remove useless suppress
* Remove useless lines
