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This patch enables authenticating by using a trust. The trust ID must be set with the parameter --os-trust-id or the env variable OS_TRUST_ID. Trusts are available for the identity v3 API. Co-Authored-By: Florent Flament <florent.flament@cloudwatt.com> Change-Id: Iacc389b203bbadda53ca31a7f5a9b8b6e1a1f522