* 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.

[BugFix] When deleting topics, instruct both master and slave nodes to delete it such that consume queues are all deleted

Minor fix for command tool, remove duplicates initCommand and missing tag ")"