*: use grpclog.LoggerV2

Signed-off-by: Gyu-Ho Lee <gyuhox@gmail.com>

tools/benchmark/cmd/util.go

@@ -18,12 +18,12 @@ import (
 	"context"
 	"crypto/rand"
 	"fmt"
-	"log"
 	"os"
 	"strings"
 
 	"github.com/coreos/etcd/clientv3"
 	"github.com/coreos/etcd/pkg/report"
+	"google.golang.org/grpc/grpclog"
 )
 
 var (
@@ -98,7 +98,7 @@ func mustCreateConn() *clientv3.Client {
 		return mustCreateConn()
 	}
 
-	clientv3.SetLogger(log.New(os.Stderr, "grpc", 0))
+	clientv3.SetLogger(grpclog.NewLoggerV2(os.Stderr, os.Stderr, os.Stderr))
 
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "dial error: %v\n", err)