Updated openstack/openstack
Project: openstack/python-glanceclient  02b00b6226436b0049e226e86210ed1c1cad53c6
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Python 3: use six.iteritems and six.string_types

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

six.string_types replaces basestring() in Python 2 and str
in Python 3.

Change-Id: Ia18510d167df35caec83626718010228e2140bc0