Updated the test_data_loader to use six.builtins vs __builtins__

v2/test/parsing/test_data_loader.py

@@ -19,6 +19,7 @@
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
+from six.moves import builtins
 from yaml.scanner import ScannerError
 
 from ansible.compat.tests import unittest
@@ -79,6 +80,6 @@ class TestDataLoaderWithVault(unittest.TestCase):
 3135306561356164310a343937653834643433343734653137383339323330626437313562306630
 3035
 """
-        with patch('__builtin__.open', mock_open(read_data=vaulted_data)):
+        with patch('builtins.open', mock_open(read_data=vaulted_data)):
             output = self._loader.load_from_file('dummy_vault.txt')
             self.assertEqual(output, dict(foo='bar'))