'Get all available cluster nodes.'

def list_cluster_nodes(self):

    api_args = {'desired-attributes': {'node-details-info': {'node': None}}}
    result = self.send_iter_request('system-node-get-iter', api_args)
    nodes_info_list = (result.get_child_by_name('attributes-list') or netapp_api.NaElement('none'))
    return [node_info.get_child_content('node') for node_info in nodes_info_list.get_children()]
