Using supplying docs produces 400 Expecting to find domain in project.

If one uses the example from doc/source/using-api-v3.rst, it triggers a 400, reported to client like this:

keystoneauth1.exceptions.http.BadRequest: Expecting to find domain in project. The server could not comply with the request since it is either malformed or otherwise incorrect. The client is assumed to be in error. (HTTP 400)

The example is like this:

    >>> auth = v3.Password(auth_url='https://my.keystone.com:5000/v3',
    ... user_id='myuserid',
    ... password='mypassword',
    ... project_id='myprojectid')

But a working code must include project domain, like this:

        auth = v3.Password(auth_url=par.authurl,
                           project_domain_id='default', project_name=project,
                           username=username, password=par.password,
                           user_domain_id='default',
                           include_catalog=True)