XOS/NEM charts, use a global registry var, split docker image name/tag/pullPolicy

Change-Id: I7f3457882830de050d1357254fc5483faf91d03f
diff --git a/xos-tools/xossh/values.yaml b/xos-tools/xossh/values.yaml
index 2ae231d..e8d03b8 100644
--- a/xos-tools/xossh/values.yaml
+++ b/xos-tools/xossh/values.yaml
@@ -19,14 +19,16 @@
 
 replicaCount: 1
 
-pull_docker_registry:
-
 nameOverride: ""
 fullnameOverride: ""
 
-imagePullPolicy: Always
+image:
+  repository: 'xosproject/xos-client'
+  tag: '{{ .Chart.AppVersion }}'
+  pullPolicy: 'Always'
 
-xosshImage: "xosproject/xos-client:master"
+global:
+  registry: ''
 
 resources: {}