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

Change-Id: Icffc569e2c152e0b413f4c7b7d9a546bd9a3ef58
diff --git a/ves-agent/values.yaml b/ves-agent/values.yaml
index 13bf8d9..137031c 100644
--- a/ves-agent/values.yaml
+++ b/ves-agent/values.yaml
@@ -16,9 +16,12 @@
 nameOverride: ""
 
 image:
-  repository: registry.hub.docker.com/opencord/ves-agent
-  tag: 1.0.0
-  pullPolicy: Always
+  repository: 'opencord/ves-agent'
+  tag: '{{ .Chart.AppVersion }}'
+  pullPolicy: 'Always'
+
+global:
+  registry: ''
 
 co_id: test_co
 pod_id: test_pod