Fix license head file

[wolfstudy]

Signed-off-by: xiaolong.ran ranxiaolong716@gmail.com

Special notes for your reviewer:

In the following file:

• cluster/loadbalance/least_active.go
• cluster/loadbalance/round_robin.go
• filter/impl/active_filter.go
• protocol/RpcStatus.go

the license head file as follows:

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

But in most files, the license head file looks like this:

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

To ensure uniformity, we should use the same format of the license head file in the same project.

Another question, should we add a check on the license head file in ci to ensure that all licenses header files submitted by contributors are the same.

[wolfstudy]

@fangyincheng @hxmhlt PTAL thanks.

[codecov-io]

Codecov Report

Merging #138 into master will increase coverage by 0.71%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #138      +/-   ##
==========================================
+ Coverage   67.64%   68.36%   +0.71%     
==========================================
  Files          69       69              
  Lines        4346     4346              
==========================================
+ Hits         2940     2971      +31     
+ Misses       1104     1073      -31     
  Partials      302      302

Impacted Files	Coverage Δ
filter/impl/active_filter.go	18.18% <ø> (ø)	⬆️
cluster/loadbalance/least_active.go	91.3% <ø> (ø)	⬆️
cluster/loadbalance/round_robin.go	88.7% <ø> (ø)	⬆️
cluster/cluster_impl/base_cluster_invoker.go	48.93% <0%> (-19.15%)	⬇️
config_center/zookeeper/listener.go	86.95% <0%> (+4.34%)	⬆️
protocol/dubbo/pool.go	62.01% <0%> (+5.02%)	⬆️
protocol/dubbo/readwriter.go	72.97% <0%> (+5.4%)	⬆️
protocol/dubbo/codec.go	77.14% <0%> (+8.57%)	⬆️
protocol/dubbo/listener.go	64.22% <0%> (+10.55%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7f0abe3...b95ea52. Read the comment docs.