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

Change-Id: I6dc4bd70fcaf230d019dda871c2d8c4cfb92c7e7
diff --git a/xos-gui/values.yaml b/xos-gui/values.yaml
index 4ea2e9d..7e54158 100644
--- a/xos-gui/values.yaml
+++ b/xos-gui/values.yaml
@@ -13,11 +13,20 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-imagePullPolicy: 'Always'
-
 # Docker Images
-xos_guiImage: 'xosproject/xos-gui:master'
-xos_wsImage: 'xosproject/xos-ws:master'
+images:
+  xos_gui:
+    repository: 'xosproject/xos-gui'
+    tag: "{{ .Chart.AppVersion }}"
+    pullPolicy: 'Always'
+
+  xos_ws:
+    repository: 'xosproject/xos-ws'
+    tag: '2.0.0'
+    pullPolicy: 'Always'
+
+global:
+  registry: ""
 
 # NodePorts
 xos_guiNodePort: 30001