apache-dubbo-2.6.2

1. Hessian-lite serialization: revert changes to locale serialization in previous release for compatibility, #1413
2. Asset transfer to ASF, including pom, license, DISCLAIMER and so on, #1491
3. Introduce new dispatcher policy: EagerThreadpool, #1568
4. Separating monitor data with group and version, #1407
5. Spring Boot Enhancenment, #1611
6. Graceful shutdown enhancement
   • Remove exporter destroy logic in AnnotationBean.
   • Waiting for registry notification on consumer side by checking channel state.
7. Simplify consumer/provider side check in RpcContext, #1444.

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1. Hessian-lite 序列化: 兼容性考虑，恢复了前一版本中修改的locale序列化, #1413
2. 资产转移至Apache软件基金会，包括pom，license，免责声明等等, #1491
3. 引入新的dispatcher策略: EagerThreadpool, #1568
4. 监控数据按照组别和版本号分离, #1407
5. Spring Boot 增强, #1611
6. 优雅关闭功能增强
   • 移除 AnnotationBean 中的出口销毁逻辑.
   • 通过检查通道状态在客户端等待注册中心通知.
7. 简化RpcContext中的消费端/服务端检查, #1444.