Comment 15 for bug 1878438

Yeah, as I said in my commit, I have a question. That is, we have API: https://docs.openstack.org/api-ref/identity/v3/?expanded=authenticating-with-an-application-credential-detail to get a new token from application credentials. Other side, if we have a token from application credential and API: https://docs.openstack.org/api-ref/identity/v3/#token-authentication-with-scoped-authorization to get token from other token. Hence why we can't to do this?