Updated openstack/openstack
Project: openstack/keystone  455219da11e4a22d7d6f2d4efa6ea063df04434d
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Unify StringIO usage with six.StringIO

Python 3 doesn't include StringIO.StringIO, but includes io.StringIO.
To unify StringIO usage, use six.StringIO instead.

See http://pythonhosted.org/six/#six.StringIO

Part of blueprint keystone-py3kcompat

Change-Id: Ieb03821ef6be2195ea2d58445de507dadee7e3d2