Don't use NotificationListener in OpenFlowPlugin components

Usage of generated interfaces extending org.opendaylight.yangtools.yang.binding.NotificationListener interface was deprecated for removal via MDSAL-496.

In order to eliminate dependency on deprecated interface the affected logic require update to use org.opendaylight.mdsal.binding.api.NotificationService.Listener instead.

Affected components:

./openflowplugin/openflowplugin-it/src/test/java/org/opendaylight/openflowplugin/openflow/md/it/SalIntegrationTest.java:                session.getSALService(NotificationService.class).registerNotificationListener(listener);