python: fix flake8 warnings and format with black

Most of the flake8 warnings in this repository were fairly trivial,
so fixed them. The "openbmctool" is 7000+ lines of pretty heavily
warned code,

python: fix flake8 warnings and format with black

Most of the flake8 warnings in this repository were fairly trivial,
so fixed them. The "openbmctool" is 7000+ lines of pretty heavily
warned code, so just disabling that one. Format everything with
black.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Icb3f6ee9bf03dece58785f7af00617c87a84aa65

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