* Adapt query service info request with new model
* Remove indexes when client disconnect
* Add distro sync client data
* Add sync delete client
* Add maintain expired cluster connection client
* 1.in server, check serviceName's format 'groupName@@serviceName', groupName and serviceName can't be blank
2.in client, check 'groupName@@serviceName', groupName and serviceName can't be blank
* ignore the check to groupName
* check split's length instead of exception to check argument
* 1.add some notes
2.remove unnecessary code
* modify the notes
* Abandon the implementation of the intermediate state of the naming module
* Add Client
* Add client manager
* Add client operation
* Add Client operation event and index manager
* Add push data to subscriber
* For checkstyle and pmd
* For checkstyle and pmd
* Remove unused method
* body string compress and opitimize request and meta info
* optimize request /header /meta info model, uniform request resolver pattern.
* delete useless code
* gzip support; using object list instead of string concat for batch listen config
* gzip support; using object list instead of string concat for batch listen config
* Add receive data and verify data distro protocol interface
* Use new distro implmentation to handle sync datum and checksum request
* Use new distro implmentation to handle get datum request.
* limiter support in rpc transport
* get next server optimize; server side notify concurrent bugfix; multi rpc client support in config module.
* toast alibaba repo refer. add client name
* rpc config change beta ips filter
* payload registry submit
* refactor request/response registry ; build response aware of server side in connection level.
* refactor request/response registry ; build response aware of server side in connection level.
* bi stream submit.
* bi stream submit.
* Add ServiceManagerTest
* Add DistroConsistencyServiceImplTest
* Add new distro entities
* Add new distro sync data change
* add new VerifyTask to do checksum.
* Replace old sync task and checksum task
* Add retry sync change task.
* Fix high cpu load
* For checkstyle
* Combine naming sync task to reduce http cost
* Move some classes
* Refactor keys combined logic
* enhance package construct
* Fix unit test
* For pmd
1. It’s a little weird to use Chinese comma in English
2. Fix typo: change 'reposity' to 'repository', 'instance' to 'instances'
3. Format other details of the doc
* 1.use server cacheMillis event service deleted
2.naming client UpdateTask's interval will inc by failCount that connect with server
* 1.move failCount to updateTask
2.redefine the updateService method name. updateServiceNow -> updateService, wrap updateService in updateServiceNow when first getServiceInfo
* 1.create push client even service is not exist
2.serviceInfo's hosts is empty or can't connect to server both add the updateTsk interval
* format the indent
* listen context query with groupy and ip support long connect
* remove connection on cleint side, server will generate instead.
* connect reset request support appointing ip address.
* server push retry
* basic api for loader balance
* basic api for loader balance
* fix `unit test method not be static` & update publish config listener in `ConfigTest.java`
* fix `unit test method not be static` & update publish config listener in `ConfigTest.java`
