Revert "Support configuring multiple OF controllers in ofagents"

This reverts commit 8916892a520a60efb847c61c3054da45cb28bdd8.

Change-Id: Iac27757a9ed44d9d180d5ec5cbf5ee2e542a3622
diff --git a/voltha/values.yaml b/voltha/values.yaml
index 313d32d..b979076 100644
--- a/voltha/values.yaml
+++ b/voltha/values.yaml
@@ -61,10 +61,10 @@
     service: voltha-etcd-cluster-client.voltha.svc.cluster.local
     port: 2379
 
-  # Define the list of controllers to connect to
+  # Define controller to which to connect
   controller:
-    - service: onos-openflow.default.svc.cluster.local
-      port: 6653
+    service: onos-openflow.default.svc.cluster.local
+    port: 6653
 
 # Define the recplica count for everything
 replicas: