List users

    CLI Example:

    .. code-block:: bash

        salt '*' keystoneng.user_list
        salt '*' keystoneng.user_list domain_id=b62e76fbeeff4e8fb77073f591cf211e

def user_list(auth=None, **kwargs):
    '''
    List users

    CLI Example:

    .. code-block:: bash

        salt '*' keystoneng.user_list
        salt '*' keystoneng.user_list domain_id=b62e76fbeeff4e8fb77073f591cf211e
    '''
    cloud = get_openstack_cloud(auth)
    kwargs = _clean_kwargs(**kwargs)
    return cloud.list_users(**kwargs)