[GitHub] [zeppelin] zjffdu opened a new pull request #3493: [ZEPPELIN-4389]. Add new interpreter if it is newly detected in interpreter folder

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zjffdu opened a new pull request #3493: [ZEPPELIN-4389]. Add new interpreter if it is newly detected in interpreter folder
URL: https://github.com/apache/zeppelin/pull/3493
 
 
   ### What is this PR for?
   For now, if we put or build new interpreter for zeppelin in `ZEPPELIN_HOME/interpreter` folder, it won't be created automatically, user have to manually create new interpreter in interpreter page.  
   
   This PR is to create the newly detected interpreter automatically for user. 
   
   
   ### What type of PR is it?
   [Improvement]
   
   ### Todos
   * [ ] - Task
   
   ### What is the Jira issue?
   * https://issues.apache.org/jira/browse/ZEPPELIN-4389
   
   ### How should this be tested?
   * Manually tested. 
   Build a fresh new zeppelin without building shell interpreter, and then start it, no shell interpreter in the interpreter setting page. Then build a new shell interpreter and restart it, shell interpreter is displayed in the interpreter setting page.
   
   ### Screenshots (if appropriate)
   
   ### Questions:
   * Does the licenses files need update? No
   * Is there breaking changes for older versions? No
   * Does this needs documentation? No
   

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