Update kube-state-metrics from v1.5.0 to v1.6.0-rc.0

* Adds a metrics collector for Ingress resources and other
improvements
* https://github.com/kubernetes/kube-state-metrics/pull/640
* https://github.com/kubernetes/kube-state-metrics/releases/tag/v1.6.0-rc.0

addons/prometheus/exporters/kube-state-metrics/cluster-role.yaml

@@ -27,6 +27,7 @@ rules:
   - daemonsets
   - deployments
   - replicasets
+  - ingresses
   verbs:
   - list
   - watch