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

Change-Id: I7f3457882830de050d1357254fc5483faf91d03f
diff --git a/xos-tools/kafkacat/templates/deployment.yaml b/xos-tools/kafkacat/templates/deployment.yaml
index 5a16db5..de219c9 100644
--- a/xos-tools/kafkacat/templates/deployment.yaml
+++ b/xos-tools/kafkacat/templates/deployment.yaml
@@ -1,5 +1,4 @@
 ---
-
 # Copyright 2018-present Open Networking Foundation
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -37,6 +36,6 @@
     spec:
       containers:
         - name: kafkacat
-          image: {{ tpl .Values.kafkacatImage . | quote }}
-          imagePullPolicy: {{ .Values.imagePullPolicy }}
+          image: {{ .Values.global.registry }}{{ .Values.image.repository }}:{{ tpl .Values.image.tag . }}
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
           command: ["/bin/bash", "-c", "sleep 86400"]