devserver: Fix lint issues.

Fix many (not all) lint issues in this directory.

BUG=None
TEST=run_unittests

Change-Id: Ifc934808c02aef45243e6a6ed099124cca4674d2
Reviewed-on: https://chromium-review.googlesource.com/354735
Commit-Ready: Don Garrett <dgarrett@chromium.org>
Tested-by: Don Garrett <dgarrett@chromium.org>
Reviewed-by: Ningning Xia <nxia@chromium.org>
diff --git a/builder_test.py b/builder_test.py
index 8fbd160..e8e8d44 100755
--- a/builder_test.py
+++ b/builder_test.py
@@ -1,15 +1,22 @@
-#!/usr/bin/python
+#!/usr/bin/python2
+
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+"""Unittests for builder.py."""
+
+from __future__ import print_function
+
 import subprocess
 import unittest
 
 import builder
 
+# pylint: disable=protected-access
 
 class BuilderTest(unittest.TestCase):
+  """Tests for builder."""
   def testOutputOf(self):
     self.assertRaises(subprocess.CalledProcessError,
                       builder._OutputOf, ['/bin/false'])