[GitHub] zeppelin issue #3159: [ZEPPELIN-3733] Refactor `Notebook*` classes to remove...

[jongyoul]

Github user jongyoul commented on the issue:

    https://github.com/apache/zeppelin/pull/3159
  
    Ready to review. This PR is for refactoring only. It doesn't change any 
behavior at all. I'll merge if this PR passes CI correctly.


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