Revert "SEBA-357 update to latest olt-service chart"

This reverts commit eeca3fa84371cfabf952f18dab32dcc6e39f415f.

Change-Id: I9a61329e00695a9ca76fc9c21c7e0081e415ca19
diff --git a/xos-services/volt/Chart.yaml b/xos-services/volt/Chart.yaml
index dd2efc2..c0a08aa 100644
--- a/xos-services/volt/Chart.yaml
+++ b/xos-services/volt/Chart.yaml
@@ -17,5 +17,5 @@
 description: A Helm chart for XOS's "olt-service" service
 icon: https://guide.opencord.org/logos/cord.svg
 
-version: 2.1.6
-appVersion: 2.1.11
+version: 2.1.5
+appVersion: 2.1.10