Tidy paths for require_once
Summary: Use .. instead of dirname(). I think that this is much neater.
Test Plan: Ran all of the affected scripts.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: epriestley, Korvin
Differential Revision: https://secure.phabricator.com/D9969