Add nginx-ingress addon switcher in k8s models

Change-Id: Ic4e537b59d3c53c3b97be3f10250769da620658e
diff --git a/classes/cluster/k8s-ha-contrail/kubernetes/init.yml b/classes/cluster/k8s-ha-contrail/kubernetes/init.yml
index 8bdf4ab..cc1253b 100644
--- a/classes/cluster/k8s-ha-contrail/kubernetes/init.yml
+++ b/classes/cluster/k8s-ha-contrail/kubernetes/init.yml
@@ -51,6 +51,7 @@
     kubernetes_contrail_network_controller: true
     kubernetes_coredns_enabled: true
     kubernetes_externaldns_enabled: false
+    kubernetes_ingressnginx_enabled: false
 
     # addresses and hostnames
     kubernetes_internal_api_address: 10.254.0.1