Updated openstack/openstack
Project: openstack/python-glanceclient  9dd03ce9ce6fa4087e6066fad26d71fab79a8ebe
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Python 3: use six.iteritems() instead of iteritems()

six.iteritems() replaces dictionary.iteritems() on Python 2 and
dictionary.items() on Python 3.

Change-Id: Ie5efa65c0a992e8136087a7b78ab8e8ce967326e