Change k8s network.engine to network.cnis list.

Change-Id: I43d26f79bed68e32c189f04120769427b7eccc81
diff --git a/classes/cluster/k8s-ha-contrail/kubernetes/control.yml b/classes/cluster/k8s-ha-contrail/kubernetes/control.yml
index de7acdc..116cd82 100644
--- a/classes/cluster/k8s-ha-contrail/kubernetes/control.yml
+++ b/classes/cluster/k8s-ha-contrail/kubernetes/control.yml
@@ -58,7 +58,8 @@
         netchecker:
           enabled: true
       network:
-        engine: opencontrail
+        cnis:
+        - opencontrail
         contrail:
           public_ip_range: 185.22.97.128/26
           public_network: default-domain:default-project:Public