func (a containerStatusbyCreatedList) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a containerStatusbyCreatedList) Less(i, j int) bool {
	return a[i].CreatedAt.After(a[j].CreatedAt)
}

func newPodContainerDeletor(runtime kubecontainer.Runtime, containersToKeep int) *podContainerDeletor {
	buffer := make(chan kubecontainer.ContainerID, containerDeletorBufferLimit)
	go wait.Until(func() {
		for {
			id := <-buffer