[ONOS-YMS-TEST] Notification service registration in YMS fails

Issue:

In YMS code, the below if condition always fails.

YmsManager::registerService()

if (defaultYangSchemaRegistry.verifyNotificationObject(yangService))

{ getYangNotificationExtendedService().registerAsListener( (ListenerService) yangManager); //TODO: register notification handler. }

Test steps:

1) Activate yms, ymstest & restconf apps
2) Run testcase testNbiNotification

export ONOS_APPS=drivers,openflow,proxyarp,mobility,fwd,yms,ymstest,restconf
onos> yms-test testNbiNotification

Test code snippet:

MultiNotificationManger multiNotificationManger = new MultiNotificationManger();
ymsService.registerService(multiNotificationManger, MultiNotification.class, null);

Confimed and fixed by: Bharat

https://github.com/GauravAgrawal-Huawei/ymsm/commit/50b8e9d655ba9a467e9a947bd9d17b48c5f7aa82