Updated openstack/openstack
Project: openstack/tempest  08f4f3a5a8aab745bf6b6a751a9c823db1874168

Fix invalid URL in AccountClientCustomizedHeader

Correct a syntax error where a string was being added instead
of being formatted.

Change-Id: I884f5e996e0d36a63b4884eb0bbeda7d70fb31ba