VOL-1247 : Modified change tuple to include previous and latest data

VOL-1214 : Fixed logs to use the proper mechanism

- Added missing license
- Moved one change tuple statement which would not include proper info

Change-Id: I5a02f6fe92c8b193642294d62f4413ac6edc0c62
diff --git a/db/model/event_bus_client.go b/db/model/event_bus_client.go
index 1ca1d78..227cb3c 100644
--- a/db/model/event_bus_client.go
+++ b/db/model/event_bus_client.go
@@ -16,7 +16,7 @@
 package model
 
 import (
-	"fmt"
+	"github.com/opencord/voltha-go/common/log"
 	"github.com/opencord/voltha-go/protos/voltha"
 )
 
@@ -28,5 +28,5 @@
 }
 
 func (ebc *EventBusClient) Publish(topic string, event voltha.ConfigEvent) {
-	fmt.Printf("publishing event:%+v, topic:%s\n", event, topic)
+	log.Debugf("publishing event:%+v, topic:%s\n", event, topic)
 }