[CORD-2791] Rename Rename VOLTTenant in VOLTServiceInstance

Change-Id: I949f0d5975b6ddde35137dbb8c927b575f3b175f
diff --git a/xos/synchronizer/models/volt.xproto b/xos/synchronizer/models/volt.xproto
index f2cb16a..c103016 100644
--- a/xos/synchronizer/models/volt.xproto
+++ b/xos/synchronizer/models/volt.xproto
@@ -5,7 +5,7 @@
      option kind = "vOLT";
 }
 
-message VOLTTenant (ServiceInstance){
+message VOLTServiceInstance (ServiceInstance){
      option kind = "vOLT";
      option owner_class_name = "VOLTService";
      option verbose_name = "vOLT Service Instance";