Updated openstack/openstack
Project: openstack/python-openstackclient  2f5e8232aa07a9031231ad7b4678b7c52c1effc4
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Python 3: fix a syntax error

"raise AttributeError, name" is invalid in Python 3.

Change-Id: Id61bd3747f49c2bd810cbfeae56506e7ed9d2bd0