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/client-go/tools/clientcmd/api/v1/doc.go

@@ -14,6 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+// +k8s:conversion-gen=k8s.io/client-go/tools/clientcmd/api
 // +k8s:deepcopy-gen=package
 
 package v1