Remove protos from Go client API

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

linux/runcopts/options.go

@@ -1,14 +0,0 @@
-package runcopts
-
-import (
-	tasks "github.com/containerd/containerd/api/services/tasks/v1"
-	"github.com/containerd/containerd/typeurl"
-)
-
-func WithExit(r *tasks.CheckpointTaskRequest) error {
-	a, err := typeurl.MarshalAny(&CheckpointOptions{
-		Exit: true,
-	})
-	r.Options = a
-	return err
-}