Voltha helm optimizations

Change-Id: I25eca498cef603f3bb2dd978a1be00810728cd49
diff --git a/voltha/templates/vcore_for_etcd.yaml b/voltha/templates/vcore_for_etcd.yaml
index 8ceb6f3..b9051ee 100644
--- a/voltha/templates/vcore_for_etcd.yaml
+++ b/voltha/templates/vcore_for_etcd.yaml
@@ -42,7 +42,7 @@
   namespace: {{ .Values.global.namespace }}
   serviceAccountName: {{ .Values.global.namespace }}-serviceaccount
 spec:
-  replicas: 3
+  replicas: {{ .Values.replicas.vcore }}
   template:
     metadata:
       labels: