Change k8s network definitions structure.

Change-Id: Ibb460339e4f059efc1da7df587cad5f79a206068
diff --git a/classes/cluster/virtual-mcp11-k8s-contrail/kubernetes/compute.yml b/classes/cluster/virtual-mcp11-k8s-contrail/kubernetes/compute.yml
index 60c2328..f8f568b 100644
--- a/classes/cluster/virtual-mcp11-k8s-contrail/kubernetes/compute.yml
+++ b/classes/cluster/virtual-mcp11-k8s-contrail/kubernetes/compute.yml
@@ -36,9 +36,8 @@
       kubelet:
         fail_on_swap: ${_param:kubelet_fail_on_swap}
       network:
-        cnis:
-        - opencontrail
-        contrail:
+        opencontrail:
+          enabled: true
           config:
             api:
               host: ${_param:opencontrail_control_address}