Applied various linter fixes.

Summary: Applied some more linter fixes that I previously missed because my global `arc` install was out-of-date.

Test Plan: Will run `arc unit` on another host.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9443