Change k8s network.engine to network.cnis list.

Change-Id: I43d26f79bed68e32c189f04120769427b7eccc81
diff --git a/classes/cluster/k8s-ha-calico/kubernetes/compute.yml b/classes/cluster/k8s-ha-calico/kubernetes/compute.yml
index fe3558f..2b91e0d 100644
--- a/classes/cluster/k8s-ha-calico/kubernetes/compute.yml
+++ b/classes/cluster/k8s-ha-calico/kubernetes/compute.yml
@@ -20,6 +20,8 @@
         address: ${_param:single_address}
         fail_on_swap: ${_param:kubelet_fail_on_swap}
       network:
+        cnis:
+        - calico
         calico:
           image: ${_param:kubernetes_calico_image}
           calicoctl_image: ${_param:kubernetes_calico_calicoctl_image}