BUG=chromium-os:11550
TEST=Verify presubmit hook catches when there are pylint errors.
Change-Id: I6b3d3f7c93d7188dd3edaea56a795567200adea2
Reviewed-on: https://gerrit.chromium.org/gerrit/41620
Reviewed-by: Chris Sosa <sosa@chromium.org>
Commit-Queue: David James <davidjames@chromium.org>
Tested-by: David James <davidjames@chromium.org>