Transient clusters do not work with python-keystoneclient >= 0.7

[Dmitry Mescheryakov]

The symptom is the following exception in the logs while creating a cluster:

AuthorizationFailure: Authentication cannot be scoped to multiple targets. Pick one of: project, domain or trust

The issue popped up after release of python-keystoneclient 0.7. The issue is caused by new keystoneclient not accepting tenant_id and trust_id simultaneously as constructor parameters. As an example of the issue, see the end of the following log:
https://sahara.mirantis.com/jenkins/job/gate-sahara-integration-transient/262/consoleText

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/83382
Committed: https://git.openstack.org/cgit/openstack/sahara/commit/?id=e15ff0498e49b2bbe886c9b7ed68e93156364382
Submitter: Jenkins
Branch: master

commit e15ff0498e49b2bbe886c9b7ed68e93156364382
Author: Dmitry Mescheryakov <email address hidden>
Date: Thu Mar 27 17:34:35 2014 +0400

    Fix transient clusters termination

    The problem started to appear in our CI jobs on March 26.
    See the bug description for details.

    Closes-Bug: #1298391

    Change-Id: I4b4102f12efd27be13255e7b0ca120d66a078673