remove tpr example

example/etcd-clusters-tpr.yaml

@@ -1,8 +0,0 @@
-apiVersion: extensions/v1beta1
-kind: ThirdPartyResource
-description: "Managed etcd clusters"
-metadata:
-  name: "etcd-cluster.coreos.com"
-versions:
-  - name: v1
-  - name: v2