update-payload-extractor: Import master update_payload

Change-Id: I94798f08b2e02677390024abcd43d45af7f585ee

update-payload-extractor/update_payload/histogram_unittest.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python2
+#!/usr/bin/env python
 #
 # Copyright (C) 2013 The Android Open Source Project
 #
@@ -17,6 +17,11 @@
 
 """Unit tests for histogram.py."""
 
+# Disable check for function names to avoid errors based on old code
+# pylint: disable-msg=invalid-name
+
+from __future__ import absolute_import
+
 import unittest
 
 from update_payload import format_utils