VOL-2834 Support to deploy multiple adapters

Generate a unique instance id for each replica of the open-onu-adapter and
pass it as a parameter.

Change-Id: I2011860aa9ca85f106704f3f12eecd5c2da1786f
diff --git a/voltha/values.yaml b/voltha/values.yaml
index 8bc8421..b979076 100644
--- a/voltha/values.yaml
+++ b/voltha/values.yaml
@@ -103,5 +103,5 @@
   rw_core:
     registry: '{{ .Values.defaults.image_registry }}'
     repository: '{{ .Values.defaults.image_org }}voltha-rw-core'
-    tag: '{{- if hasKey .Values.defaults "image_tag" }}{{- if .Values.defaults.image_tag }}{{ .Values.defaults.image_tag }}{{- else }}2.3.5{{- end }}{{- else }}2.3.5{{- end }}'
+    tag: '{{- if hasKey .Values.defaults "image_tag" }}{{- if .Values.defaults.image_tag }}{{ .Values.defaults.image_tag }}{{- else }}2.4.0{{- end }}{{- else }}2.4.0{{- end }}'
     pullPolicy: '{{ .Values.defaults.image_pullPolicy }}'