Apply ClusterRoleBinding to dnsmaq when rbac_enabled (#1592)

* Add RBAC policies to dnsmasq

* fix merge conflict

* yamllint

* use .j2 extension for dnsmasq autoscaler

roles/dnsmasq/templates/dnsmasq-serviceaccount.yml

@@ -0,0 +1,8 @@
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: dnsmasq
+  namespace: "{{ system_namespace }}"
+  labels:
+    kubernetes.io/cluster-service: "true"