creating a domain scoped token

create_token.json

{
  "auth": {
    "identity": {
      "methods": [
        "password"
        ],
      "password": {
        "user": {
          "domain": {
            "name": "Default"
          },
          "name": "admin",
          "password": "openstack"
        }
      }
    },
    "scope": {
      "domain": {
        "name": "Default"
      }
    }
  }
}