Updated openstack/openstack
Project: openstack/python-openstackclient  e43c0f2b9b8b1e75959179646c212fdaf3d00265

Python 3: do not use __builtin__

Use six.moves.builtins instead, this works with both Python 2 and 3.

Change-Id: I57e7257d4f06c805f26383e0778ad104d50ea139