[VOL-4290] Voltha go library updates for gRPC migration

Change-Id: I1aa2774beb6b7ed7419bc45aeb53fcae8a8ecda0
diff --git a/vendor/go.etcd.io/etcd/clientv3/logger.go b/vendor/go.etcd.io/etcd/clientv3/logger.go
index f5ae010..3276372 100644
--- a/vendor/go.etcd.io/etcd/clientv3/logger.go
+++ b/vendor/go.etcd.io/etcd/clientv3/logger.go
@@ -18,7 +18,7 @@
 	"io/ioutil"
 	"sync"
 
-	"go.etcd.io/etcd/pkg/logutil"
+	"github.com/coreos/etcd/pkg/logutil"
 
 	"google.golang.org/grpc/grpclog"
 )