Rename Image to CheckpointPath in shim

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

linux/shim/init.go

@@ -235,7 +235,7 @@ func (p *initProcess) Checkpoint(context context.Context, r *shimapi.CheckpointR
 	defer os.RemoveAll(work)
 	if err := p.runc.Checkpoint(context, p.id, &runc.CheckpointOpts{
 		WorkDir:                  work,
-		ImagePath:                r.Image,
+		ImagePath:                r.CheckpointPath,
 		AllowOpenTCP:             r.AllowTcp,
 		AllowExternalUnixSockets: r.AllowUnixSockets,
 		AllowTerminal:            r.AllowTerminal,

linux/task.go

@@ -159,7 +159,7 @@ func (c *Task) Checkpoint(ctx context.Context, opts plugin.CheckpointOpts) error
 		AllowTerminal:    opts.AllowTerminal,
 		FileLocks:        opts.FileLocks,
 		EmptyNamespaces:  opts.EmptyNamespaces,
-		Image:            opts.Path,
+		CheckpointPath:   opts.Path,
 	})
 	return err
 }