When using IDENTITY_API_VERSION=3, the clouds.yaml must also set auth/user_domain_id and project_domain_id. Change-Id: If028f2935ea729276f40039a4003c07c08e91672
If the user already has a clouds.yaml, update it with the "devstack" entry. Change-Id: Id02378b6f3a86f9fee201d91688205705202c0a8