[GitHub] lizhanhui opened a new pull request #194: [ROCKETMQ-315]Enhance TLS default settings

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lizhanhui opened a new pull request #194: [ROCKETMQ-315]Enhance TLS default settings
URL: https://github.com/apache/rocketmq/pull/194
 
 
   Let broker connect nameserver using non-encrypted channel if permissive is adopted
   
   ## What is the purpose of the change
   
   Purpose of this Pull Request is to let broker establish an unencrypted channel against name server by default(permissive mode), bringing compatibility among new broker and previous versions of nameservers. 
   
   ## Brief changelog
   
   Change default settings.
   
   ## Verifying this change
   
   N/A
   
   Follow this checklist to help us incorporate your contribution quickly and easily:
   
   - [x] Make sure there is a [JIRA issue](https://issues.apache.org/jira/projects/ROCKETMQ/issues/) filed for the change (usually before you start working on it). Trivial changes like typos do not require a JIRA issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue. 
   - [ ] Format the pull request title like `[ROCKETMQ-XXX] Fix UnknownException when host config not exist`. Each commit in the pull request should have a meaningful subject line and body.
   - [ ] Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
   - [ ] Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add integration-test in [test module](https://github.com/apache/rocketmq/tree/master/test).
   - [ ] Run `mvn -B clean apache-rat:check findbugs:findbugs checkstyle:checkstyle` to make sure basic checks pass. Run `mvn clean install -DskipITs` to make sure unit-test pass. Run `mvn clean test-compile failsafe:integration-test`  to make sure integration-test pass.
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