Updated openstack/openstack
Project: openstack/python-heatclient  1dabd8c6de1caa473ff62baa57e9057dbbb39edc
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Python3: use six.iteritems() rather than dict.iteritems()

This is compatible with both Python 2 and 3.

Change-Id: If8c3a4a6fe028a3a1dc6899f0f4e65c89403d267