## What is the purpose of the change add a config to enable or disable telnet,see #2795
## Brief changelog add a config (enable-telne) to enable or disable telnet (1).you can config to disable telnet in spring xml config file like this ``` <dubbo:application name="demo-provider" enable-telnet="false"/> ``` (2).you can also use org.apache.dubbo.config.ApplicationConfig#setEnableTelnet to disable or enable telnet (3).if you want to enable telnet,do not config this value or config it to true ## Verifying this change XXXXX Follow this checklist to help us incorporate your contribution quickly and easily: - [x] Make sure there is a [GITHUB_issue](https://github.com/apache/incubator-dubbo/issues) filed for the change (usually before you start working on it). Trivial changes like typos do not require a GITHUB 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 `[Dubbo-XXX] Fix UnknownException when host config not exist #XXX`. 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/incubator-dubbo/tree/master/dubbo-test). - [ ] Run `mvn clean install -DskipTests` & `mvn clean test-compile failsafe:integration-test` to make sure unit-test and integration-test pass. - [ ] If this contribution is large, please follow the [Software Donation Guide](https://github.com/apache/incubator-dubbo/wiki/Software-donation-guide). [ Full content available at: https://github.com/apache/incubator-dubbo/pull/2809 ] This message was relayed via gitbox.apache.org for [email protected]
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