Update containerd to 70e0c8443f.

Signed-off-by: Lantao Liu <lantaol@google.com>

vendor/github.com/containerd/containerd/client.go

@@ -133,7 +133,7 @@ func (c *Client) Containers(ctx context.Context, filters ...string) ([]Container
 // NewContainer will create a new container in container with the provided id
 // the id must be unique within the namespace
 func (c *Client) NewContainer(ctx context.Context, id string, opts ...NewContainerOpts) (Container, error) {
-	ctx, done, err := c.withLease(ctx)
+	ctx, done, err := c.WithLease(ctx)
 	if err != nil {
 		return nil, err
 	}
@@ -214,7 +214,7 @@ func (c *Client) Pull(ctx context.Context, ref string, opts ...RemoteOpt) (Image
 	}
 	store := c.ContentStore()
 
-	ctx, done, err := c.withLease(ctx)
+	ctx, done, err := c.WithLease(ctx)
 	if err != nil {
 		return nil, err
 	}
@@ -587,7 +587,7 @@ func (c *Client) Import(ctx context.Context, ref string, reader io.Reader, opts
 		return nil, err
 	}
 
-	ctx, done, err := c.withLease(ctx)
+	ctx, done, err := c.WithLease(ctx)
 	if err != nil {
 		return nil, err
 	}

vendor/github.com/containerd/containerd/image.go

@@ -86,6 +86,12 @@ func (i *image) IsUnpacked(ctx context.Context, snapshotterName string) (bool, e
 }
 
 func (i *image) Unpack(ctx context.Context, snapshotterName string) error {
+	ctx, done, err := i.client.WithLease(ctx)
+	if err != nil {
+		return err
+	}
+	defer done()
+
 	layers, err := i.getLayers(ctx, platforms.Default())
 	if err != nil {
 		return err

vendor/github.com/containerd/containerd/lease.go

@@ -51,7 +51,8 @@ func (c *Client) ListLeases(ctx context.Context) ([]Lease, error) {
 	return leases, nil
 }
 
-func (c *Client) withLease(ctx context.Context) (context.Context, func() error, error) {
+// WithLease attaches a lease on the context
+func (c *Client) WithLease(ctx context.Context) (context.Context, func() error, error) {
 	_, ok := leases.Lease(ctx)
 	if ok {
 		return ctx, func() error {

vendor/github.com/containerd/containerd/task.go

@@ -356,7 +356,7 @@ func (t *task) Resize(ctx context.Context, w, h uint32) error {
 }
 
 func (t *task) Checkpoint(ctx context.Context, opts ...CheckpointTaskOpts) (Image, error) {
-	ctx, done, err := t.client.withLease(ctx)
+	ctx, done, err := t.client.WithLease(ctx)
 	if err != nil {
 		return nil, err
 	}