issue #477: older Ansibles had no vars plugin base class.

tests/ansible/lib/vars/custom_modifies_os_environ.py

@@ -1,16 +1,12 @@
 # https://github.com/dw/mitogen/issues/297
 
 from __future__ import (absolute_import, division, print_function)
-__metaclass__ = type
 
-from ansible.plugins.vars import BaseVarsPlugin
 import os
 
-class VarsModule(BaseVarsPlugin):
+class VarsModule(object):
     def __init__(self, *args):
-        super(VarsModule, self).__init__(*args)
         os.environ['EVIL_VARS_PLUGIN'] = 'YIPEEE'
 
     def get_vars(self, loader, path, entities, cache=True):
-        super(VarsModule, self).get_vars(loader, path, entities)
         return {}