Revert "Put containerd-shim into pod cgroup"

This reverts commit e9cf1d5909.

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

pkg/opts/task.go

@@ -1,22 +0,0 @@
-package opts
-
-import (
-	"context"
-
-	"github.com/containerd/containerd"
-	"github.com/containerd/containerd/linux/runcopts"
-)
-
-// WithContainerdShimCgroup returns function that sets the containerd
-// shim cgroup path
-func WithContainerdShimCgroup(path string) containerd.NewTaskOpts {
-	return func(_ context.Context, _ *containerd.Client, r *containerd.TaskInfo) error {
-		r.Options = &runcopts.CreateOptions{
-			ShimCgroup: path,
-		}
-		return nil
-	}
-}
-
-//TODO: Since Options is an interface different WithXXX will be needed to set different
-// combinations of CreateOptions.