Fix cros lint issues in chromite/scripts.

Fix or disable all cros lint warnings in scripts.

BUG=None
TEST=Ran pylint.

Change-Id: Iedd2f2e361ea82c082f1c95c9054ac15d19193ff
Reviewed-on: https://chromium-review.googlesource.com/190730
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Tested-by: Don Garrett <dgarrett@chromium.org>
Commit-Queue: Don Garrett <dgarrett@chromium.org>
diff --git a/scripts/cros_unittest.py b/scripts/cros_unittest.py
index bdcbfde..5de0aa5 100755
--- a/scripts/cros_unittest.py
+++ b/scripts/cros_unittest.py
@@ -4,6 +4,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+"""Unittests for cros."""
+
 import os
 import sys