VOL-1596 Add Support for handling multicast groups in OpenOLT Adapter.
VOL-1595 Add Support for handling multicast flows in OpenOLT Adapter.

Depends voltha-protos from the patch below:
https://gerrit.opencord.org/#/c/16690/

Change-Id: I1cc9900bd6400bb31aed11beda674138838a21d2
diff --git a/adaptercore/olt_state_transitions.go b/adaptercore/olt_state_transitions.go
index feb07d7..697ee5f 100644
--- a/adaptercore/olt_state_transitions.go
+++ b/adaptercore/olt_state_transitions.go
@@ -21,7 +21,7 @@
 	"reflect"
 	"runtime"
 
-	"github.com/opencord/voltha-lib-go/v2/pkg/log"
+	"github.com/opencord/voltha-lib-go/v3/pkg/log"
 )
 
 // DeviceState OLT Device state