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The use of [keystone_authtoken] credentials for trust creation is now deprecated. refer to [1][2][3] [1]d16f07ea3c/releasenotes/notes/trustee-conf-section-5994dcd48a9744d7.yaml
[2] https://docs.openstack.org/sahara/latest/configuration/descriptionconfig.html [3]d60a3b152b/sahara/utils/openstack/keystone.py (L116)
Change-Id: I75002c6221268a3371585cf270dee18186471ef5