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pylint reports a number of issues for PRESUBMIT.py. One of them is a
real error (using an undefined variable instead of a file name), the
rest just nits. Still, good to fix them all to allow pylint discover
new failures easily in the future.

Bug: 821981
Change-Id: I857be0b4072bfe41687c52d38335d5efebcc952f
Reviewed-on: https://chromium-review.googlesource.com/966502
Commit-Queue: Vaclav Brozek <vabr@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543934}