Add nginx-ingress addon switcher in k8s models

Change-Id: Ic4e537b59d3c53c3b97be3f10250769da620658e
diff --git a/classes/cluster/k8s-ha-calico-flannel-virtlet/kubernetes/init.yml b/classes/cluster/k8s-ha-calico-flannel-virtlet/kubernetes/init.yml
index 22b959a..7640dc8 100644
--- a/classes/cluster/k8s-ha-calico-flannel-virtlet/kubernetes/init.yml
+++ b/classes/cluster/k8s-ha-calico-flannel-virtlet/kubernetes/init.yml
@@ -87,6 +87,7 @@
     kubernetes_coredns_enabled: true
     kubernetes_externaldns_enabled: false
     kubernetes_metallb_enabled: false
+    kubernetes_ingressnginx_enabled: false
 
   linux:
     network: