[GitHub] zjffdu opened a new pull request #3309: [ZEPPELIN-4007]. Travis CI is broken for branch-0.8

[GitBox <gi...@apache.org>]

zjffdu opened a new pull request #3309: [ZEPPELIN-4007]. Travis CI is broken for branch-0.8
URL: https://github.com/apache/zeppelin/pull/3309
 
 
   ### What is this PR for?
   
   This PR fix several issues on branch-0.8 to make the CI pass. 
   
   1. netty of python's grpc dependencies is conflicted with that of spark. This PR upgrade the grpc version of python interpreter.
   2. change paragraph running via z.runNote from blocking to non-blocking. Otherwise the paragraph output is missing (ZeppelinSparkClusterTest#zRunTest will fail). 
   3. Separate each spark version integration into separate classes. Just like what we did in #3306
   
   ### What type of PR is it?
   [Bug Fix | Refactoring]
   
   ### Todos
   * [ ] - Task
   
   ### What is the Jira issue?
   * https://jira.apache.org/jira/browse/ZEPPELIN-4007
   
   ### How should this be tested?
   * CI pass
   
   ### 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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