GitLab

Pyformat and lean up config validation logic.

Minor changes in warning messages, but no other logic changes.

Change-Id: I3641831df502de28caa707aad96f883b84cee50d
Reviewed-on: https://chromium-review.googlesource.com/c/1355979Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615615}