Ignore fifo error when using v2 multi-container shim

When using a multi-container shim, the fifo of the 2nd to Nth container
will not be opened when the ctx is done. This will cause an
`ErrReadClosed` that can be ignored.

Signed-off-by: Li Yuxuan <liyuxuan04@baidu.com>

runtime/v2/binary.go

@@ -85,13 +85,10 @@ func (b *binary) Start(ctx context.Context, opts *types.Any, onClose func()) (_
 	// copy the shim's logs to containerd's output
 	go func() {
 		defer f.Close()
-		if _, err := io.Copy(os.Stderr, f); err != nil {
-			// When using a multi-container shim the 2nd to Nth container in the
-			// shim will not have a separate log pipe. Ignore the failure log
-			// message here when the shim connect times out.
-			if !os.IsNotExist(errors.Cause(err)) {
-				log.G(ctx).WithError(err).Error("copy shim log")
-			}
+		_, err := io.Copy(os.Stderr, f)
+		err = checkCopyShimLogError(ctx, err)
+		if err != nil {
+			log.G(ctx).WithError(err).Error("copy shim log")
 		}
 	}()
 	out, err := cmd.CombinedOutput()