test:为代理模块的测试类添加 Apache License 2.0 开源许可证

- 在 FileCertChangeSourceTest、GrpcServerTest、GrpcSslContextTest、
  MultiProtocolTlsHelperTest 和 TlsCertificateManagerTest 五个测试类中
  添加了 Apache License 2.0 开源许可证的版权信息
- 删除了 GrpcSslContextTest 中的重复代码

Signed-off-by: Async <raisinata@foxmail.com>

Author: EnableAsync

proxy/src/test/java/org/apache/rocketmq/proxy/grpc/GrpcServerTest.java

@@ -1,3 +1,19 @@
+/*
+ * 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.
+ */
 package org.apache.rocketmq.proxy.grpc;
 
 import io.grpc.Server;

proxy/src/test/java/org/apache/rocketmq/proxy/grpc/GrpcSslContextTest.java

@@ -1,7 +1,22 @@
+/*
+ * 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.
+ */
 package org.apache.rocketmq.proxy.grpc;
 
 import io.grpc.netty.shaded.io.grpc.netty.GrpcHttp2ConnectionHandler;
-import io.grpc.netty.shaded.io.netty.channel.ChannelHandler;
 import io.grpc.netty.shaded.io.netty.channel.ChannelHandlerContext;
 import io.grpc.netty.shaded.io.netty.channel.ChannelPipeline;
 import io.grpc.netty.shaded.io.netty.handler.ssl.SslContext;
@@ -29,8 +44,6 @@
 import org.powermock.reflect.Whitebox;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.Mockito.when;
 
 @RunWith(MockitoJUnitRunner.class)

proxy/src/test/java/org/apache/rocketmq/proxy/remoting/MultiProtocolTlsHelperTest.java

@@ -1,3 +1,19 @@
+/*
+ * 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.
+ */
 package org.apache.rocketmq.proxy.remoting;
 
 import io.netty.handler.ssl.OpenSsl;

proxy/src/test/java/org/apache/rocketmq/proxy/service/cert/FileCertChangeSourceTest.java

@@ -1,3 +1,19 @@
+/*
+ * 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.
+ */
 package org.apache.rocketmq.proxy.service.cert;
 
 import java.io.File;

proxy/src/test/java/org/apache/rocketmq/proxy/service/cert/TlsCertificateManagerTest.java

@@ -1,3 +1,19 @@
+/*
+ * 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.
+ */
 package org.apache.rocketmq.proxy.service.cert;
 
 import java.io.InputStream;