Fix backward compatibility with single network engine definitions.

Change-Id: Ib022b5b3bfdac630312c97b06ca100b0ef4a1673
diff --git a/tests/pillar/master_contrail.sls b/tests/pillar/master_contrail.sls
index 627b032..b2941b1 100644
--- a/tests/pillar/master_contrail.sls
+++ b/tests/pillar/master_contrail.sls
@@ -2,9 +2,6 @@
   common:
     cluster_domain: cluster.local
     cluster_name: cluster
-    network:
-      cnis:
-      - opencontrail
     hyperkube:
       image: hyperkube-amd64:v1.6.4-3
       hash: hnsj0XqABgrSww7Nqo7UVTSZLJUt2XRd
@@ -75,9 +72,8 @@
       address: 10.0.175.100
       allow_privileged: true
     network:
-      cnis:
-      - opencontrail
-      contrail:
+      opencontrail:
+        enabled: true
         config:
           api:
             host: 10.0.170.70