Update vendor

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

@@ -0,0 +1,33 @@
+package supervisor
+
+import (
+	"time"
+
+	"github.com/docker/containerd/runtime"
+)
+
+type StatsTask struct {
+	baseTask
+	ID   string
+	Stat chan *runtime.Stat
+}
+
+func (s *Supervisor) stats(t *StatsTask) error {
+	start := time.Now()
+	i, ok := s.containers[t.ID]
+	if !ok {
+		return ErrContainerNotFound
+	}
+	// TODO: use workers for this
+	go func() {
+		s, err := i.container.Stats()
+		if err != nil {
+			t.ErrorCh() <- err
+			return
+		}
+		t.ErrorCh() <- nil
+		t.Stat <- s
+		ContainerStatsTimer.UpdateSince(start)
+	}()
+	return errDeferredResponse
+}