Fix backward compatibility with single network engine definitions.

Change-Id: Ib022b5b3bfdac630312c97b06ca100b0ef4a1673
diff --git a/tests/pillar/common_storageclass.sls b/tests/pillar/common_storageclass.sls
index 613cc13..11bae00 100644
--- a/tests/pillar/common_storageclass.sls
+++ b/tests/pillar/common_storageclass.sls
@@ -15,9 +15,8 @@
       kube-system:
         enabled: true
     network:
-      cnis:
-      - calico
       calico:
+        enabled: true
         calicoctl_image: calico/ctl
         cni_image: calico/cni
         etcd: