* fix #1976
System Topic like SCHEDULE_TOPIC_XXXX should not be create or delete by user

* User can not send message to system topic SCHEDULE_TOPIC_XXXX

* the-->The

* fix magic number 18

* move system topic to TopicValidator except TBW102

* move TBW102 and isSystemTopic to TopicValidator

* add test code

* validateTopic --> validatorSystemTopic, validatorBlacklistTopic

* validateTopic --> validatorSystemTopic, validatorBlacklistTopic

* rename some methods

  mqadmin tools with command clusterRT/checkMsgSendRT, there are
  spell error for message amount in long format option type.

* Polish 'no route info of this topic' exception.

* Write exception to log

* Modify logic that cannot connect to nameserver

* Solve the problem that the regression test does not pass.

* Adapt to lite pull consumer

* Make checkNameServerSetting function private and change its name.

* Remove the useless files

* Replace PermSize with MetaspaceSize, details see http://openjdk.java.net/jeps/122

* Update DLedgerCommitLog.java (#1145)

Delete useless code

* Remove the duplicate content

* Polish the comment (#1107)

* Minor Typo fix  (#860)

* [ISSUE #1082] Fix disconnection of HA (#1083)

* fixed the text description in chinese doc (#1339)

* fix /dev/shm not found on some OSs (#1345)

* Refactor the protection logic when pulling

* change the MQVersion variable to rocketmq 4.5.2 version;

* Minor polish

* Fix the wrong package name

* [maven-release-plugin] prepare release rocketmq-all-4.5.2

* [maven-release-plugin] prepare for next development iteration

* [RIP-15]Add Ipv6 support for RocketMQ

[ISSUE #598] Enhance transaction by putting messages that exceed max check times to system topic (#633)

* add logic of putting message that exceeds max-check-times to system topic TRANS_CHECK_MAXTIME_TOPIC

* add test case:testResolveDiscardMsg

* add @after logic to test case

* comment brokerController.shutdown and use mock

* add logic of resuming half message check

* add test case:resumeCheckHalfMessage

* delete commented codes

* [issue#1164]return the codes to original reput method part.

* [issue#1164]fix issue that Consumer Instance can't consume message from slave when cluster is in the high level tps and master has been killed.

* [issue#1164]if the broker is a master node,then modify reputFromOffset correctly.

* [issue#1164]add some coding comments.

* [ISSUE#1156]new mqadmin API for ACL configuration.Add dataVersion and write data to acl yaml config file in the acl module.

* [ISSUE#1156]add unit test cases for new acl mqadmin API command which adding dataversion part.

* [ISSUE#1156]implement update,delete and query Acl config version in new acl mqadmin API command.

* [ISSUE#1156]polish and optimize the implementation for new acl mqadmin API command.

* [ISSUE#1156]fix the issues that topicPerms and groupPerms can't be updated and there is NPE when querying acl config version.

* [ISSUE#1156]fix small issue that specify wrong plainAccessConfig attribute,the correct one is AccessKey.

* [ISSUE#1156]add updateGlobalWhiteAddr subcommand codes for mqadmin acl command.

* [ISSUE#1156]adjust some codes for cluster acl config version list in the mqadmin acl commands.

* [ISSUE#1156]add acl mqadmin command part in the acl user_guide docs.

* [ISSUE#1156]polish and optimize some part of acl mqadmin command codes.

* [ISSUE#1156]fix code comments issue that the first letter needs to be capitalized and adjust the contents of acl user_guide.

[ISSUE #1147]Broker will report Exception if open the aclEnable and enableDLegerCommitLog flag at the same time. (#1149)

* [issue#1078]fix User can't use mqadmin command normally if they don't copy the tool.yml file to their related fold and AclEnable flag is closed.

* [issue#1147]Broker will report Exception if open the aclEnable and enableDLegerCommitLog flag at the same time.

* [issue#1147]Broker will report Exception if open the aclEnable and enableDLegerCommitLog flag at the same time.

* [issue#1147]Add the restriction of Acl in the acl's user guide.

* [issue#1147]Adjust some codes for acl issue that users can't open the aclEnable and use Master/Slave or Dledger the same time.

* [issue#1147]Adjust and optimize some codes for acl issue that users can't open the aclEnable and use Master/Slave or Dledger the same time.

* [issue#1147]return back for original codes for acl issue that users can't open the aclEnable and use Master/Slave or Dledger the same time.

[ISSUE #1078]fix User can't use mqadmin command normally if they don't copy the tool.yml file to related fold and AclEnable flag is closed.  (#1079)

* [issue#1078]fix User can't use mqadmin command normally if they don't copy the tool.yml file to their related fold and AclEnable flag is closed.

[RIP-10] Add test cases for UpdateKvConfigCommand

[ISSUE#662]capitalizing the first letter in comments and removing the unless comments for acl and msg trace feature codes. (#669)

* [ISSUE#662]capitalizing the first letter in comments and removing the  unless comments for acl and msg trace feature codes.

* [ISSUE#662]polish the acl feature codes.

* [ISSUE#403] fix some bugs and Optimization code for rocketmq's acl feature. 

* [ISSUE#403] fix some bugs and Optimization code for rocketmq's acl feature. 

* Update MQAdminStartup.java

* Update MQAdminStartup.java

[ISSUE #525] Support the message track,these committed codes have supported trace_topic name value Configurable by users.