Remove explicit unpack on all container creates

This only performs an unpack if there is an error when creating the
container snapshot (and only if it's a "not found' error) since it should
already be unpacked.

Signed-off-by: Brian Goff <brian.goff@docker.com>

pkg/server/sandbox_run.go

@@ -148,8 +148,7 @@ func (c *criContainerdService) RunPodSandbox(ctx context.Context, r *runtime.Run
 
 	opts := []containerd.NewContainerOpts{
 		containerd.WithSnapshotter(c.config.ContainerdConfig.Snapshotter),
-		customopts.WithImageUnpack(image.Image),
-		containerd.WithNewSnapshot(id, image.Image),
+		customopts.WithNewSnapshot(id, image.Image),
 		containerd.WithSpec(spec, specOpts...),
 		containerd.WithContainerLabels(sandboxLabels),
 		containerd.WithContainerExtension(sandboxMetadataExtension, &sandbox.Metadata),