CORD-770 add no-op delete_record() step

Change-Id: I38db1322224f2fab52ce66492e7d0d1079a996db
diff --git a/xos/synchronizer/steps/sync_exampletenant.py b/xos/synchronizer/steps/sync_exampletenant.py
index 8b969a1..80685e9 100644
--- a/xos/synchronizer/steps/sync_exampletenant.py
+++ b/xos/synchronizer/steps/sync_exampletenant.py
@@ -56,3 +56,8 @@
         fields['service_message'] = exampleservice.service_message
         return fields
 
+    def delete_record(self, port):
+        # Nothing needs to be done to delete an exampleservice; it goes away
+        # when the instance holding the exampleservice is deleted.
+        pass
+