* 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

* [ROCKETMQ-308]  nameserver socket buffer use default value.

(cherry picked from commit e9fcb07)

* [ROCKETMQ-308]  delete unused import

(cherry picked from commit 3bcefff)

Author: lindzh <linsony0@163.com>

Closes #168 from lindzh/fix_print.

Signed-off-by: Nshroman <rshtykh@yahoo.com>

[ROCKETMQ-208]incompatibility problem found in enviroment of JDK 1.7 when running client closes apache/incubator-rocketmq#10

[ROCKETMQ-208]incompatibility problem found in enviroment of JDK 1.7 when running client closes apache/incubator-rocketmq#10