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/github.com/go-openapi/jsonreference/go.mod

@@ -0,0 +1,12 @@
+module github.com/go-openapi/jsonreference
+
+require (
+	github.com/PuerkitoBio/purell v1.1.1
+	github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect
+	github.com/go-openapi/jsonpointer v0.19.3
+	github.com/stretchr/testify v1.3.0
+	golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297 // indirect
+	golang.org/x/text v0.3.2 // indirect
+)
+
+go 1.13