fix(region): avoid update tags task loop

pkg/cloudcommon/db/metadata.go

@@ -607,7 +607,7 @@ func (manager *SMetadataManager) GetAll(obj IModel, keys []string, keyPrefix str
 	ret := make(map[string]string)
 	for _, rec := range records {
 		if len(rec.Value) > 0 || strings.HasPrefix(rec.Key, USER_TAG_PREFIX) || strings.HasPrefix(rec.Key, CLOUD_TAG_PREFIX) {
-			ret[rec.Key] = rec.Value
+			ret[strings.ToLower(rec.Key)] = rec.Value
 		}
 	}
 	return ret, nil