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/mocks/mockAdapterProxy.go b/mocks/mockAdapterProxy.go
index 19b59de..817e675 100644
--- a/mocks/mockAdapterProxy.go
+++ b/mocks/mockAdapterProxy.go
@@ -22,7 +22,7 @@
 	"errors"
 
 	"github.com/golang/protobuf/proto"
-	"github.com/opencord/voltha-protos/v2/go/inter_container"
+	"github.com/opencord/voltha-protos/v3/go/inter_container"
 )
 
 // MockAdapterProxy mocks the AdapterProxy interface.