1. update clientset, deepcopy using code-generator

2. add a dummy file tools.go to force "go mod vendor" to see
code-generator as dependencies
3. add a script to update CRD
4. add a README to document CRD updating steps
run go mod tidy
update README

pkg/client/clientset/versioned/fake/clientset_generated.go

@@ -41,7 +41,7 @@ func NewSimpleClientset(objects ...runtime.Object) *Clientset {
 		}
 	}
 
-	cs := &Clientset{}
+	cs := &Clientset{tracker: o}
 	cs.discovery = &fakediscovery.FakeDiscovery{Fake: &cs.Fake}
 	cs.AddReactor("*", "*", testing.ObjectReaction(o))
 	cs.AddWatchReactor("*", func(action testing.Action) (handled bool, ret watch.Interface, err error) {
@@ -63,12 +63,17 @@ func NewSimpleClientset(objects ...runtime.Object) *Clientset {
 type Clientset struct {
 	testing.Fake
 	discovery *fakediscovery.FakeDiscovery
+	tracker   testing.ObjectTracker
 }
 
 func (c *Clientset) Discovery() discovery.DiscoveryInterface {
 	return c.discovery
 }
 
+func (c *Clientset) Tracker() testing.ObjectTracker {
+	return c.tracker
+}
+
 var _ clientset.Interface = &Clientset{}
 
 // SnapshotV1beta1 retrieves the SnapshotV1beta1Client