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_generate_sysroot_unittest.py b/scripts/cros_generate_sysroot_unittest.py
index 8f326ea..b97d6db 100755
--- a/scripts/cros_generate_sysroot_unittest.py
+++ b/scripts/cros_generate_sysroot_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_generate_sysroot."""
+
 import os
 import sys
 
@@ -25,6 +27,8 @@
 
 
 class CrosGenMock(partial_mock.PartialMock):
+  """Helper class to Mock out cros_generate_sysroot.GenerateSysroot."""
+
   TARGET = 'chromite.scripts.cros_generate_sysroot.GenerateSysroot'
   ATTRS = ('_InstallToolchain', '_InstallKernelHeaders',
            '_InstallBuildDependencies')
@@ -53,6 +57,7 @@
 
 
 class OverallTest(cros_test_lib.MockTempDirTestCase):
+  """Tests for cros_generate_sysroot."""
 
   def setUp(self):
     self.cg_mock = self.StartPatcher(CrosGenMock())