Without up-reving hacking python 3.12 can't be used for pep8/flake8
checks. Also address a few new pyflakes issues that seem reasonable
to enforce:
E275 missing whitespace after keyword
H214 Use assertIn/NotIn(A, B) rather than
assertTrue/False(A in/not in B)
H211 do not compare types, use assert{Is,IsNot}Instance
Add F811 (redefinition of unused 'function'), as this check makes
client.py fail.
And noqa some longer lines that we're happy to carry.
Change-Id: Ic97698a310ffe7114b668b8c4bc0195f6997bb45
1e0ab242ca