VOL-3588 Update OFAgent to support new version of protos

Change-Id: Ic3944779f9a600ebcd5d7a916616f473059e311e
diff --git a/internal/pkg/openflow/utils.go b/internal/pkg/openflow/utils.go
index ffe4e52..08de458 100644
--- a/internal/pkg/openflow/utils.go
+++ b/internal/pkg/openflow/utils.go
@@ -19,7 +19,7 @@
 import (
 	"fmt"
 	ofp "github.com/opencord/goloxi/of13"
-	"github.com/opencord/voltha-protos/v3/go/openflow_13"
+	"github.com/opencord/voltha-protos/v4/go/openflow_13"
 	"strings"
 	"sync"
 )