!2 isula-build: fix a small typo

Merge pull request !2 from jingxiaolu/fix_typo

api/services/control.proto

 // Copyright (c) Huawei Technologies Co., Ltd. 2020. All rights reserved.
-// isula-build licensed under the Mulan PSL v1.
-// You can use this software according to the terms and conditions of the Mulan PSL v1.
+// isula-build licensed under the Mulan PSL v2.
+// You can use this software according to the terms and conditions of the Mulan PSL v2.
 // You may obtain a copy of Mulan PSL v2 at:
 //     http://license.coscl.org.cn/MulanPSL
 // THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR
 // IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR
 // PURPOSE.
-// See the Mulan PSL v1 for more details.
+// See the Mulan PSL v2 for more details.
 // Description: iSulad Build
 // Author: Jingxiao Lu
 // Create: 2020-01-19