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/autoupdate_lib.py b/autoupdate_lib.py
index 2e7a08b..76dd081 100644
--- a/autoupdate_lib.py
+++ b/autoupdate_lib.py
@@ -4,6 +4,8 @@
 
 """Module containing common autoupdate utilities and protocol dictionaries."""
 
+from __future__ import print_function
+
 import datetime
 import os
 import time