Update vendor

vendor/github.com/docker/containerd/supervisor/get_containers.go

@@ -0,0 +1,28 @@
+package supervisor
+
+import "github.com/docker/containerd/runtime"
+
+type GetContainersTask struct {
+	baseTask
+	ID         string
+	Containers []runtime.Container
+}
+
+func (s *Supervisor) getContainers(t *GetContainersTask) error {
+
+	if t.ID != "" {
+		ci, ok := s.containers[t.ID]
+		if !ok {
+			return ErrContainerNotFound
+		}
+		t.Containers = append(t.Containers, ci.container)
+
+		return nil
+	}
+
+	for _, ci := range s.containers {
+		t.Containers = append(t.Containers, ci.container)
+	}
+
+	return nil
+}