Setting containerd shim cgroup same as pod cgroup

Signed-off-by: Abhinandan Prativadi <abhi@docker.com>

pkg/opts/task.go

@@ -0,0 +1,22 @@
+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.