[lint] Actually make flake8 do something

[suo]

Stack from ghstack:

• [lint] Actually make flake8 do something #30892 [lint] Actually make flake8 do something

Fixes all outstanding lints and actually installs a properly configured
flake8

Differential Revision: D18862825

[albanD]

Looks good, small questions.
Not sure if the fbgemm is expected though.

[kostmo]

CircleCI build failures summary

As of commit c595231:

• 1/1 broken upstream at merge base 26c5146 (see grid view)
  • You may want to rebase on the viable/strict branch (see its recency history):
    • If your commit is older than viable/strict:

      git fetch viable/strict
      git rebase viable/strict
      

    • If your commit is newer than viable/strict, you can try basing on an older, stable commit:

      git fetch viable/strict
      git rebase --onto viable/strict $(git merge-base origin/master HEAD)
      

• 0/1 failures introduced in this PR

Detailed failure analysis (WIP)

Here are the reasons each build failed:

1 failure recognized by patterns:

pytorch_linux_xenial_py3_clang5_asan_build

Step: Build

Dec 06 21:34:04 caused by: Connection refused (os error 111)

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[facebook-github-bot]

@suo merged this pull request in 62b1072.