Update containerd to f88d3e5d6d.

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

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

@@ -110,12 +110,16 @@ func (c *Client) dispatch(ctx context.Context, req *Request, resp *Response) err
 	}
 
 	select {
+	case <-ctx.Done():
+		return ctx.Err()
 	case c.calls <- call:
 	case <-c.done:
 		return c.err
 	}
 
 	select {
+	case <-ctx.Done():
+		return ctx.Err()
 	case err := <-errs:
 		return filterCloseErr(err)
 	case <-c.done:

vendor/github.com/containerd/ttrpc/server.go

@@ -127,13 +127,13 @@ func (s *Server) Serve(ctx context.Context, l net.Listener) error {
 
 func (s *Server) Shutdown(ctx context.Context) error {
 	s.mu.Lock()
-	lnerr := s.closeListeners()
 	select {
 	case <-s.done:
 	default:
 		// protected by mutex
 		close(s.done)
 	}
+	lnerr := s.closeListeners()
 	s.mu.Unlock()
 
 	ticker := time.NewTicker(200 * time.Millisecond)