adjust calico-kube-controller to use hostNetwork when using etcd as datastore (#9573)

roles/kubernetes-apps/policy_controller/calico/templates/calico-kube-controllers.yml.j2

@@ -21,6 +21,9 @@ spec:
     spec:
       nodeSelector:
         {{ calico_policy_controller_deployment_nodeselector }}
+{% if calico_datastore == "etcd" %}
+      hostNetwork: true
+{% endif %}
       serviceAccountName: calico-kube-controllers
       tolerations:
         - key: CriticalAddonsOnly