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

Change-Id: I6dc4bd70fcaf230d019dda871c2d8c4cfb92c7e7
diff --git a/xos-core/templates/core-deployment.yaml b/xos-core/templates/core-deployment.yaml
index 54b2a5a..a785392 100644
--- a/xos-core/templates/core-deployment.yaml
+++ b/xos-core/templates/core-deployment.yaml
@@ -28,8 +28,8 @@
     spec:
       containers:
         - name: xos-core
-          image: {{ tpl .Values.xos_coreImage . | quote }}
-          imagePullPolicy: {{ .Values.imagePullPolicy }}
+          image: {{ .Values.global.registry }}{{ .Values.images.xos_core.repository }}:{{ tpl .Values.images.xos_core.tag . }}
+          imagePullPolicy: {{ .Values.images.xos_core.pullPolicy }}
           command: ["/bin/bash", "-c", "cd coreapi; ./start_coreapi.sh"]
           ports:
             - containerPort: 50051