d6bca955377863cc957eea4ebbb2fb6fb0fc2dea
According to http://docs.openstack.org/developer/hacking/ it should be preferred to use six.add_metaclass instead of __metaclass__. Added new requirement six >= 1.6.0. Change-Id: Ic7e4f5cb03889cc6bfdb04a657d4654b5fedc985
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