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

vendor/k8s.io/api/autoscaling/v2beta2/generated.proto

@@ -32,7 +32,7 @@ option go_package = "v2beta2";
 
 // CrossVersionObjectReference contains enough information to let you identify the referred resource.
 message CrossVersionObjectReference {
-  // Kind of the referent; More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#types-kinds"
+  // Kind of the referent; More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
   optional string kind = 1;
 
   // Name of the referent; More info: http://kubernetes.io/docs/user-guide/identifiers#names
@@ -69,12 +69,12 @@ message ExternalMetricStatus {
 // implementing the scale subresource based on the metrics specified.
 message HorizontalPodAutoscaler {
   // metadata is the standard object metadata.
-  // More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#metadata
+  // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
   // +optional
   optional k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;
 
   // spec is the specification for the behaviour of the autoscaler.
-  // More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#spec-and-status.
+  // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status.
   // +optional
   optional HorizontalPodAutoscalerSpec spec = 2;