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This patch adds support for creating application credentials in keystone[1]. Application credentials can be created by any user for themselves. An application credential is created for the currently selected project. A user may provide their own secret for the application credential, or may allow keystone to generate a secret for them. After the application credential is created, the secret is revealed once to the user. At that point they may download a clouds.yaml or openrc file that contains the application credential secret and will enable them to use it to authenticate. The secret is not revealed again. [1] https://docs.openstack.org/keystone/latest/user/application_credentials.html bp application-credentials Depends-On: https://review.openstack.org/557927 Depends-On: https://review.openstack.org/557932 Change-Id: Ida2e836cf81d2b96e0b66afed29a900c312223a4