Add k8s metallb switch parameter in k8s models

Use part of private adresses pool for metallb addresses.
By default metallb is disabled.

Change-Id: I60f62abbbf5681a91304c88560912f43802a89f2
Related-PROD: PROD-21474
diff --git a/classes/cluster/k8s-ha-calico/kubernetes/control.yml b/classes/cluster/k8s-ha-calico/kubernetes/control.yml
index 9c854ff..4dd4bc3 100644
--- a/classes/cluster/k8s-ha-calico/kubernetes/control.yml
+++ b/classes/cluster/k8s-ha-calico/kubernetes/control.yml
@@ -56,6 +56,10 @@
           enabled: ${_param:kubernetes_externaldns_enabled}
           image: ${_param:kubernetes_externaldns_image}
           provider: ${_param:kubernetes_externaldns_provider}
+        metallb:
+          enabled: ${_param:kubernetes_metallb_enabled}
+          addresses:
+          - ${_param:kubernetes_metallb_addresses_pool}
     master:
       kubelet:
         address: ${_param:single_address}