For non-XOS charts, use a global registry var, split docker image name/tag/pullPolicy

Change-Id: Icffc569e2c152e0b413f4c7b7d9a546bd9a3ef58
diff --git a/mavenrepo/values.yaml b/mavenrepo/values.yaml
index 9dc7975..f5bdd17 100644
--- a/mavenrepo/values.yaml
+++ b/mavenrepo/values.yaml
@@ -1,3 +1,4 @@
+---
 # Copyright 2017-present Open Networking Foundation
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -14,8 +15,13 @@
 
 # helm install mavenrepo -n mavenrepo
 
-mavenRepoImage: 'opencord/mavenrepo:latest'
-imagePullPolicy: Always
+image:
+  repository: 'opencord/mavenrepo'
+  tag: '{{ .Chart.AppVersion }}'
+  pullPolicy: 'Always'
+
+global:
+  registry: ''
 
 nameOverride: ""
 fullnameOverride: ""