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/node/v1alpha1/generated.proto

@@ -45,19 +45,19 @@ message Overhead {
 // pod.  For more details, see
 // https://git.k8s.io/enhancements/keps/sig-node/runtime-class.md
 message RuntimeClass {
-  // 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;
 
   // Specification of the RuntimeClass
-  // 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 RuntimeClassSpec spec = 2;
 }
 
 // RuntimeClassList is a list of RuntimeClass objects.
 message RuntimeClassList {
   // Standard list 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.ListMeta metadata = 1;
 
@@ -88,5 +88,31 @@ message RuntimeClassSpec {
   // This field is alpha-level as of Kubernetes v1.15, and is only honored by servers that enable the PodOverhead feature.
   // +optional
   optional Overhead overhead = 2;
+
+  // Scheduling holds the scheduling constraints to ensure that pods running
+  // with this RuntimeClass are scheduled to nodes that support it.
+  // If scheduling is nil, this RuntimeClass is assumed to be supported by all
+  // nodes.
+  // +optional
+  optional Scheduling scheduling = 3;
+}
+
+// Scheduling specifies the scheduling constraints for nodes supporting a
+// RuntimeClass.
+message Scheduling {
+  // nodeSelector lists labels that must be present on nodes that support this
+  // RuntimeClass. Pods using this RuntimeClass can only be scheduled to a
+  // node matched by this selector. The RuntimeClass nodeSelector is merged
+  // with a pod's existing nodeSelector. Any conflicts will cause the pod to
+  // be rejected in admission.
+  // +optional
+  map<string, string> nodeSelector = 1;
+
+  // tolerations are appended (excluding duplicates) to pods running with this
+  // RuntimeClass during admission, effectively unioning the set of nodes
+  // tolerated by the pod and the RuntimeClass.
+  // +optional
+  // +listType=atomic
+  repeated k8s.io.api.core.v1.Toleration tolerations = 2;
 }