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/statsmanager.go b/adaptercore/statsmanager.go
index c42e86b..0905c1e 100755
--- a/adaptercore/statsmanager.go
+++ b/adaptercore/statsmanager.go
@@ -23,9 +23,9 @@
 	"sync"
 	"time"
 
-	"github.com/opencord/voltha-lib-go/v2/pkg/log"
-	"github.com/opencord/voltha-protos/v2/go/openolt"
-	"github.com/opencord/voltha-protos/v2/go/voltha"
+	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+	"github.com/opencord/voltha-protos/v3/go/openolt"
+	"github.com/opencord/voltha-protos/v3/go/voltha"
 )
 
 var mutex = &sync.Mutex{}
@@ -355,7 +355,7 @@
 
 	var metricInfo voltha.MetricInformation
 	var ke voltha.KpiEvent2
-	var volthaEventSubCatgry voltha.EventSubCategory_EventSubCategory
+	var volthaEventSubCatgry voltha.EventSubCategory_Types
 
 	if portType == "NNIStats" {
 		volthaEventSubCatgry = voltha.EventSubCategory_NNI