VOL-3588 Update OFAgent to support new version of protos

Change-Id: Ic3944779f9a600ebcd5d7a916616f473059e311e
diff --git a/cmd/ofagent/common.go b/cmd/ofagent/common.go
index d54fdde..ebefcc0 100644
--- a/cmd/ofagent/common.go
+++ b/cmd/ofagent/common.go
@@ -18,7 +18,7 @@
 package main
 
 import (
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
 )
 
 var logger log.CLogger