Add nginx-ingress addon switcher in k8s models

Change-Id: Ic4e537b59d3c53c3b97be3f10250769da620658e
diff --git a/classes/cluster/sl-k8s-calico/kubernetes/control.yml b/classes/cluster/sl-k8s-calico/kubernetes/control.yml
index f078d3f..a55ccd8 100644
--- a/classes/cluster/sl-k8s-calico/kubernetes/control.yml
+++ b/classes/cluster/sl-k8s-calico/kubernetes/control.yml
@@ -57,6 +57,8 @@
           enabled: ${_param:kubernetes_metallb_enabled}
           addresses:
           - ${_param:kubernetes_metallb_addresses_pool}
+        ingress-nginx:
+          enabled: ${_param:kubernetes_ingressnginx_enabled}
     master:
       kubelet:
         address: ${_param:single_address}