fix: s3cli enable debug trace

pkg/multicloud/objectstore/objectstore.go

@@ -16,6 +16,7 @@ package objectstore
 
 import (
 	"net/url"
+	"os"
 	"time"
 
 	"yunion.io/x/jsonutils"
@@ -85,6 +86,10 @@ func NewObjectStoreClientAndFetch(providerId string, providerName string, endpoi
 	client.client = cli
 	client.SetVirtualObject(&client)
 
+	if isDebug {
+		cli.TraceOn(os.Stderr)
+	}
+
 	if doFetch {
 		err = client.FetchBuckets()
 		if err != nil {