From d33168b59d8c9c41ae7fefe193cd64e617b10de3 Mon Sep 17 00:00:00 2001
From: Cao Xuan Hoang <hoangcx@vn.fujitsu.com>
Date: Mon, 5 Dec 2016 11:21:52 +0700
Subject: [PATCH] Use six.add_metaclass instead of __metaclass__

Trivialfix

Change-Id: I12e94ee980fd63f68eb8de7dd6223eefb0c16557
---
 tools/base.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/base.py b/tools/base.py
index 545ff7c5a..9cf13e881 100644
--- a/tools/base.py
+++ b/tools/base.py
@@ -11,10 +11,11 @@
 # under the License.
 
 import abc
+import six
 
 
+@six.add_metaclass(abc.ABCMeta)
 class ValidatorBase(object):
-    __metaclass__ = abc.ABCMeta
 
     @staticmethod
     @abc.abstractmethod