restructure certwriter and certprovisioner packages

Author: Mengqi Yu

example/main.go

@@ -103,8 +103,7 @@ func main() {
 	as, err := webhook.NewServer("foo-admission-server", mgr, webhook.ServerOptions{
 		Port:    443,
 		CertDir: "/tmp/cert",
-		//Client:  mgr.GetClient(),
-		KVMap: map[string]interface{}{"foo": "bar"},
+		KVMap:   map[string]interface{}{"foo": "bar"},
 		BootstrapOptions: &webhook.BootstrapOptions{
 			Secret: &apitypes.NamespacedName{
 				Namespace: "default",

pkg/webhook/admission/builder/builder.go

@@ -195,7 +195,7 @@ func (b *WebhookBuilder) Build(handlers ...admission.Handler) (*admission.Webhoo
 			Rule: admissionregistrationv1beta1.Rule{
 				APIGroups:   []string{gvk.Group},
 				APIVersions: []string{gvk.Version},
-				Resources:   []string{mapping.Resource},
+				Resources:   []string{mapping.Resource.Resource},
 			},
 		},
 	}