'Delete a user.
For a full list of available parameters, please refer to the official
API reference:
https://developer.openstack.org/api-ref/identity/v2-admin/index.html#delete-user-admin-endpoint'

def delete_user(self, user_id):

    (resp, body) = self.delete(('users/%s' % user_id))
    self.expected_success(204, resp.status)
    return rest_client.ResponseBody(resp, body)
