VOL-1888 Not enough info in ONU DGI to Identify the ONU.

         Fixed to fetch the serial number from the list of ONUs
         handled by the device handler from the onu-id and the
         intf-id which is sent by the openolt agent in the dgi
         indication.

Change-Id: I54342b9009d4d12c0efa3745d1f48567f183c245
diff --git a/adaptercore/device_handler.go b/adaptercore/device_handler.go
index 95bc170..ab30edd 100644
--- a/adaptercore/device_handler.go
+++ b/adaptercore/device_handler.go
@@ -514,7 +514,7 @@
 	}
 	/* TODO: Instantiate Alarm , stats , BW managers */
 	/* Instantiating Event Manager to handle Alarms and KPIs */
-	dh.eventMgr = NewEventMgr(dh.EventProxy)
+	dh.eventMgr = NewEventMgr(dh.EventProxy, dh)
 
 	// Start reading indications
 	go dh.readIndications()