Updated openstack/openstack
Project: openstack/oslo.messaging  062c8ac7dd15d723f250987d2650c7d55e490ace
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Replace dict.iteritems() with six.iteritems()

dict.iteritems() was replaced with dict.items() in Python 3. Use the
six.iteritems() function to get code compatible with Python 2 and Python 3.

Change-Id: I0c8ecc3ae540ffaf4c6b159e09ca16ccf365973d