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

Change-Id: I7f3457882830de050d1357254fc5483faf91d03f
diff --git a/xos-services/epc-service/Chart.yaml b/xos-services/epc-service/Chart.yaml
index 47e6af6..fc914fe 100644
--- a/xos-services/epc-service/Chart.yaml
+++ b/xos-services/epc-service/Chart.yaml
@@ -16,4 +16,7 @@
 
 name: epc-service
 description: A Helm chart for XOS's "epc-service" service
-version: 1.0.0
+icon: https://guide.opencord.org/logos/cord.svg
+
+version: 1.1.1
+appVersion: 1.1.1