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

Change-Id: I7f3457882830de050d1357254fc5483faf91d03f
diff --git a/xos-services/openstack/Chart.yaml b/xos-services/openstack/Chart.yaml
index bd187f7..c9084d5 100644
--- a/xos-services/openstack/Chart.yaml
+++ b/xos-services/openstack/Chart.yaml
@@ -15,4 +15,7 @@
 
 name: openstack
 description: A Helm chart for XOS's "openstack" service
-version: 1.0.0
+icon: https://guide.opencord.org/logos/cord.svg
+
+version: 1.0.2
+appVersion: 1.0.2