CORD-1008 set required_models for exampleservice synchronizer

Change-Id: I30d69bbebe3e53c49518f43ce109d8829a07b217
diff --git a/xos/synchronizer/exampleservice_from_api_config b/xos/synchronizer/exampleservice_from_api_config
index e55e519..9bc0188 100644
--- a/xos/synchronizer/exampleservice_from_api_config
+++ b/xos/synchronizer/exampleservice_from_api_config
@@ -16,3 +16,4 @@
 enable_watchers=True
 accessor_kind=api
 accessor_password=@/opt/xos/services/exampleservice/credentials/xosadmin@opencord.org
+required_models=ExampleService, ExampleTenant, CoarseTenant, ServiceMonitoringAgentInfo