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/rest/OWNERS

@@ -20,7 +20,6 @@ reviewers:
 - resouer
 - cjcullen
 - rmmh
-- lixiaobing10051267
 - asalkeld
 - juanvallejo
 - lojies