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/spec/go.mod

@@ -0,0 +1,17 @@
+module github.com/go-openapi/spec
+
+require (
+	github.com/go-openapi/jsonpointer v0.19.3
+	github.com/go-openapi/jsonreference v0.19.2
+	github.com/go-openapi/swag v0.19.5
+	github.com/kr/pty v1.1.5 // indirect
+	github.com/stretchr/objx v0.2.0 // indirect
+	github.com/stretchr/testify v1.3.0
+	golang.org/x/crypto v0.0.0-20190611184440-5c40567a22f8 // indirect
+	golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297 // indirect
+	golang.org/x/sys v0.0.0-20190616124812-15dcb6c0061f // indirect
+	golang.org/x/tools v0.0.0-20190614205625-5aca471b1d59 // indirect
+	gopkg.in/yaml.v2 v2.2.2
+)
+
+go 1.13