Add RBAC support for canal (#1604)

Refactored how rbac_enabled is set
Added RBAC to ubuntu-canal-ha CI job
Added rbac for calico policy controller

roles/network_plugin/canal/templates/canal-crb-calico.yml.j2

@@ -0,0 +1,14 @@
+---
+# Bind the calico ClusterRole to the canal ServiceAccount.
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: ClusterRoleBinding
+metadata:
+  name: canal-calico
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: calico
+subjects:
+- kind: ServiceAccount
+  name: canal
+  namespace: {{ system_namespace }}