Updated openstack/openstack
Project: openstack/python-keystoneclient  2d1cc878033c9dee997c12f937bd92f32599071b

Using six.u('') instead of u''

In a few places, there's some u'' strings, this patch replaces
them by six.u(''), as this fixes things when running the unit
tests in Debian Wheezy.

Change-Id: I60c01f85901a33a0e3e7a255049084126558f031