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-compact/kubernetes/init.yml b/classes/cluster/k8s-compact/kubernetes/init.yml
index 7a71f6a..fd00525 100644
--- a/classes/cluster/k8s-compact/kubernetes/init.yml
+++ b/classes/cluster/k8s-compact/kubernetes/init.yml
@@ -49,3 +49,5 @@
     kubernetes_virtlet_enabled: true
     kubernetes_coredns_enabled: false
     kubernetes_externaldns_enabled: false
+    kubernetes_metallb_addresses_pool: 172.16.10.60-172.16.10.80
+    kubernetes_metallb_enabled: false
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