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/klog/.travis.yml

@@ -5,11 +5,12 @@ go:
   - 1.9.x
   - 1.10.x
   - 1.11.x
+  - 1.12.x
 script:
   - go get -t -v ./...
   - diff -u <(echo -n) <(gofmt -d .)
   - diff -u <(echo -n) <(golint $(go list -e ./...))
-  - go tool vet .
+  - go tool vet . || go vet .
   - go test -v -race ./...
 install:
   - go get golang.org/x/lint/golint