Adding it to the end caused issues since a cpplint.py version comes
preinstalled on the system at /usr/bin/cpplint.py, that is actually a symlink to
a bash script.
When the presubmit script is run, it uses python to run this bash script, causing it to fail.

Change-Id: Ib12cbdf20265c14e7252f30c268b5b4a9ce32193
Reviewed-on: https://chromium-review.googlesource.com/999595
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>