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

Change-Id: I7f3457882830de050d1357254fc5483faf91d03f
diff --git a/xos-gui/templates/gui-deployment.yaml b/xos-gui/templates/gui-deployment.yaml
index 153a6bf..d8d8b13 100644
--- a/xos-gui/templates/gui-deployment.yaml
+++ b/xos-gui/templates/gui-deployment.yaml
@@ -28,8 +28,8 @@
     spec:
       containers:
         - name: xos-gui
-          image: {{ tpl .Values.xos_guiImage . | quote }}
-          imagePullPolicy: {{ .Values.imagePullPolicy }}
+          image: {{ .Values.global.registry }}{{ .Values.images.xos_gui.repository }}:{{ tpl .Values.images.xos_gui.tag . }}
+          imagePullPolicy: {{ .Values.images.xos_gui.pullPolicy }}
           ports:
             - containerPort: 4000
               port: 4000