functools provide reduce instead of the ansible

The ansible 'reduce' function is itself imported from the functools:
https://github.com/ansible/ansible/blob/devel/lib/ansible/module_utils/six/__init__.py#L273

And thus provides exactly the same functionality.
Furthermore, the functools is part of python lib since 2.7,
so the result should be compatible across all of our releases.

Signed-off-by: Jiri Podivin <jpodivin@redhat.com>
Change-Id: I981512fa81f0eb2aac0a50a4709c517cce794fa8

validations_common/callback_plugins/validation_json.py

@@ -19,8 +19,8 @@ import time
 import os
 
 from functools import partial
+from functools import reduce
 
-from ansible.module_utils.six.moves import reduce
 from ansible.parsing.ajson import AnsibleJSONEncoder
 from ansible.plugins.callback import CallbackBase
 

validations_common/callback_plugins/validation_stdout.py

@@ -16,7 +16,7 @@ __metaclass__ = type
 import datetime
 import os
 
-from ansible.module_utils.six.moves import reduce
+from functools import reduce
 from ansible.plugins.callback import CallbackBase
 
 DOCUMENTATION = '''