Fix Prometheus etcd target discovery #561
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* Prometheus was configured to use kubernetes discovery of etcd targets based on nodes matching the node label node-role.kubernetes.io/controller=true * Kubernetes v1.16 stopped permitting node role labels node-role.kubernetes.io/* so Typhoon renamed these labels (no longer any association with roles) to node.kubermetes.io/controller=true * As a result, Prometheus didn't discover etcd targets, etcd metrics were missing, etcd alerts were ineffective, and the etcd Grafana dashboard was empty * Introduced: #543
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node-role.kubernetes.io/controller=truenode.kubermetes.io/controller=true