Updated openstack/openstack
Project: openstack/keystone  d132e0b3790345b3d9714fd39803665a461ef79d
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Use six to make dict work in Python 2 and Python 3

Dict's interface changed a lot between Python 2 and Python 3.
Use six to make dict work in them.
This is mapping:

six            Python 2        Python 3
six.iterkeys   dict.iterkeys   dict.keys
six.itervalues dict.itervalues dict.values
six.iteritems  dict.iteritems  dict.items

Part of blueprint keystone-py3kcompat

Change-Id: If41b19353f07853e39064f848ba74e9cdfd9bd14