Return a list of VMs with minimal information

    CLI Example

    .. code-block:: bash

        salt-cloud -f list_nodes_min myopenstack

def list_nodes_min(conn=None, call=None):
    '''
    Return a list of VMs with minimal information

    CLI Example

    .. code-block:: bash

        salt-cloud -f list_nodes_min myopenstack

    '''
    if call == 'action':
        raise SaltCloudSystemExit(
            'The list_nodes_min function must be called with -f or --function.'
        )
    if conn is None:
        conn = get_conn()
    ret = {}
    for node in conn.list_servers(bare=True):
        ret[node.name] = {'id': node.id, 'state': node.status}
    return ret