Add some automatic python linting about minigo HOT 5 CLOSED

Plan is to auto-run linting, formatting check, and tests on code submission. for linting, there'll be a blacklist while things are cleaned up.

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I've still got more files to clean up, but this is automatic now.

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Have we got some docs on how to do this/what our project-wide flags are for autopep8?

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By default, autopep8 is fairly lax about whitespace and will for example allow function arguments that span multiple lines to be formatted in a bunch of different ways. This is different from something like clang-format, which enforces a one-true-way of formatting.

You can run autopep8 with two -a command line arguments to tell it to be much more aggressive about reformatting whitespace. Maybe we should consider using that?

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I'm happy with the linter in our automated testing enforcing no style regressions and gradually adding things to be linted.

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