For non-XOS charts, use a global registry var, split docker image name/tag/pullPolicy

Change-Id: Icffc569e2c152e0b413f4c7b7d9a546bd9a3ef58
diff --git a/storage/rook-tools/values.yaml b/storage/rook-tools/values.yaml
index 468e300..5fafd08 100644
--- a/storage/rook-tools/values.yaml
+++ b/storage/rook-tools/values.yaml
@@ -17,7 +17,11 @@
 
 rookClusterNamespace: 'rook-ceph'
 
-rookCephToolsImage: 'rook/ceph-toolbox:v0.8.1'
+image:
+  repository: 'rook/ceph-toolbox'
+  tag: '{{ .Chart.AppVersion }}'
+  pullPolicy: 'IfNotPresent'
 
-imagePullPolicy: 'IfNotPresent'
+global:
+  registry: ''