[VOL-3091] configurable kafka topic

Make core-topic and adapter topics configurable in voltha-helm-charts
This is required to run multiple voltha stacks in a k8s deployment.

Also, read the kv_store_data_prefix via environment variable.
https://gerrit.opencord.org/#/c/19001/

Change-Id: I8fabda3ce70f1379f735796e6711f4282e57008a
diff --git a/voltha-adapter-openolt/values.yaml b/voltha-adapter-openolt/values.yaml
index 7c8fce3..4090902 100644
--- a/voltha-adapter-openolt/values.yaml
+++ b/voltha-adapter-openolt/values.yaml
@@ -20,6 +20,14 @@
   image_tag: ~
   image_org: "voltha/"
   image_pullPolicy: "Always"
+  topics:
+    core_topic: "rwcore"
+    adapter_open_olt_topic: "openolt"
+  
+  # Define prefix path for etcd
+  # If you're running multiple voltha stacks the this value 
+  # should be unique across the stacks.
+  kv_store_data_prefix: "service/voltha"
 
 # Define connectivity to required services
 services:
@@ -42,7 +50,8 @@
 
 # Define the recplica count for everything
 replicas:
-  adapter_open_olt: 1
+  current_replica: 1
+  total_replica: 1
 
 adapter_open_olt:
   log_level: '{{ .Values.defaults.log_level }}'