Change k8s network.engine to network.cnis list.

Change-Id: I43d26f79bed68e32c189f04120769427b7eccc81
diff --git a/classes/cluster/sl-k8s-calico/kubernetes/control.yml b/classes/cluster/sl-k8s-calico/kubernetes/control.yml
index 94481d8..6ffe418 100644
--- a/classes/cluster/sl-k8s-calico/kubernetes/control.yml
+++ b/classes/cluster/sl-k8s-calico/kubernetes/control.yml
@@ -39,6 +39,8 @@
         ssl:
           enabled: true
       network:
+        cnis:
+        - calico
         calico:
           etcd:
             ssl: