Change __metaclass__ with optimal six.add_metaclass

Use six.add_metaclass instead of __metaclass__.[1]

[1]http://docs.openstack.org/developer/hacking/# 

Change-Id: I1cb4af33beb5b08b08cfb18c2a06ccd520d14a8e
This commit is contained in:
gengchc2 2016-09-30 06:07:51 +00:00
parent a4c49fab02
commit b1bf0177df

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