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/openolt_eventmgr.go b/adaptercore/openolt_eventmgr.go
index 19661ea..75086dc 100644
--- a/adaptercore/openolt_eventmgr.go
+++ b/adaptercore/openolt_eventmgr.go
@@ -21,10 +21,10 @@
 	"fmt"
 	"strconv"
 
-	"github.com/opencord/voltha-lib-go/v2/pkg/adapters/adapterif"
-	"github.com/opencord/voltha-lib-go/v2/pkg/log"
-	oop "github.com/opencord/voltha-protos/v2/go/openolt"
-	"github.com/opencord/voltha-protos/v2/go/voltha"
+	"github.com/opencord/voltha-lib-go/v3/pkg/adapters/adapterif"
+	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+	oop "github.com/opencord/voltha-protos/v3/go/openolt"
+	"github.com/opencord/voltha-protos/v3/go/voltha"
 )
 
 const (