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

This reverts commit 1f58c2afbd680c8c618bff6f66e9982515dd1caf.

Change-Id: I0d7ef37a420168276472675b005482d6d11daabd
diff --git a/xos-tools/kafkacat/values.yaml b/xos-tools/kafkacat/values.yaml
index 6b96e1b..ae6d055 100644
--- a/xos-tools/kafkacat/values.yaml
+++ b/xos-tools/kafkacat/values.yaml
@@ -19,16 +19,11 @@
 
 replicaCount: 1
 
+pull_docker_registry:
+
 nameOverride: ""
 fullnameOverride: ""
 
 imagePullPolicy: Always
 
-image:
-  repository: 'confluentinc/cp-kafkacat'
-  tag: '{{ .Chart.AppVersion }}'
-  pullPolicy: 'Always'
-
-global:
-  registry: ''
-
+kafkacatImage: "confluentinc/cp-kafkacat:4.0.2"