Fix pep8 tool output parsing.

Review Request #8850 — Created March 27, 2017 and submitted — Latest diff uploaded

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ReviewBot
master
f6dc0f4...

Reviewers

I'm about to kill the pep8 tool (in favor of pycodestyle), but until I do, it
should still run. This change fixes the output parsing (which I broke during
some code cleanup).

Tested that output parsed correctly.