Use system level for etcd instead of service

- Use etcd system level

Change-Id: Ie321547562f74a0a05343a1034efcf3596951aca
diff --git a/classes/cluster/sl-k8s-calico/kubernetes/control.yml b/classes/cluster/sl-k8s-calico/kubernetes/control.yml
index a55ccd8..a316fb8 100644
--- a/classes/cluster/sl-k8s-calico/kubernetes/control.yml
+++ b/classes/cluster/sl-k8s-calico/kubernetes/control.yml
@@ -1,5 +1,5 @@
 classes:
-- service.etcd.server.cluster
+- system.etcd.server.cluster
 - service.kubernetes.control.cluster
 - system.haproxy.proxy.listen.kubernetes.apiserver
 - system.keepalived.cluster.instance.kube_api_server_vip