Add metrics-server addon switcher in k8s models

Related story: https://mirantis.jira.com/browse/PROD-24599

Change-Id: I040ba6e5fa7eac552bc9c6fb7f7738440d1fc26c
diff --git a/classes/cluster_deprecated/sl-k8s-contrail/kubernetes/control.yml b/classes/cluster_deprecated/sl-k8s-contrail/kubernetes/control.yml
index 7de9af4..cf233b2 100644
--- a/classes/cluster_deprecated/sl-k8s-contrail/kubernetes/control.yml
+++ b/classes/cluster_deprecated/sl-k8s-contrail/kubernetes/control.yml
@@ -38,6 +38,8 @@
           provider: ${_param:kubernetes_externaldns_provider}
         ingress-nginx:
           enabled: ${_param:kubernetes_ingressnginx_enabled}
+        metrics-server:
+          enabled: ${_param:kubernetes_metrics_server_enabled}
     master:
       etcd:
         ssl: