Voltha helm optimizations

Change-Id: I25eca498cef603f3bb2dd978a1be00810728cd49
diff --git a/voltha/templates/ofagent.yaml b/voltha/templates/ofagent.yaml
index 5f6d81e..124f0b4 100644
--- a/voltha/templates/ofagent.yaml
+++ b/voltha/templates/ofagent.yaml
@@ -19,7 +19,7 @@
   namespace: {{ .Values.global.namespace }}
   serviceAccountName: {{ .Values.global.namespace }}-serviceaccount
 spec:
-  replicas: 3
+  replicas: {{ .Values.replicas.ofagent }}
   template:
     metadata:
       labels: