@staticmethod
def _get_disk_config_path(instance, suffix=''):
    return os.path.join(libvirt_utils.get_instance_path(instance), ('disk.config' + suffix))
@staticmethod
def _get_disk_config_path(instance, suffix=):
    return os.path.join(libvirt_utils.get_instance_path(instance), ('disk.config' + suffix))