ZEPPELIN-3309. Import/Clone user not set in Paragraph causes NPE.

[gss2002]

What is this PR for?
During Import/Clone Paragraph set "user" to eliminate NPEs thrown in Helium and other functions leaving unusable notebooks.

What type of PR is it?
[Bug Fix]

Todos

What is the Jira issue?
https://issues.apache.org/jira/browse/ZEPPELIN-3309

How should this be tested?
Manually tested using Import/Clone of Notebooks and attempt to adjust bound interpreters

Screenshots (if appropriate)

Questions:
Does the licenses files need update? No
Is there breaking changes for older versions? No
Does this needs documentation? No
Author: Greg Senia gsenia@apache.org

[gss2002]

@zjffdu I think this pull request should be good. There looks to be some issues with travis unrelated to the code changes. And I ran the tests a few times not sure whats up with it.

[gss2002]

@zjffdu any reason why travis-ci is failing on disk issues?

travis_time:end:20c877c0:start=1520617145805371744,finish=1520617145811589622,duration=6217878
�[0Ktravis_fold:end:after_failure.11
�[0Ktravis_fold:start:after_failure.12
�[0Ktravis_time:start:09d64a64
�[0K$ cat livy/target/tmp/livy-int-test/MiniYarnMain/target/org.apache.livy.test.framework.MiniYarnMain////stderr
cat: livy/target/tmp/livy-int-test/MiniYarnMain/target/org.apache.livy.test.framework.MiniYarnMain////stderr: No such file or directory

travis_time:end:09d64a64:start=1520617145818231645,finish=1520617145824458197,duration=6226552
�[0Ktravis_fold:end:after_failure.12
�[0K
Done. Your build exited with 1.
grep: write error: No space left on device

[zjffdu]

@gss2002 Could you try rerun it again ?

[gss2002]

@zjffdu the only test not passing was the e2e test which I am re-runnin gnow.. Let me know if I need to do anything else.

[zjffdu]

Thanks @gss2002 , the e2e test is fixed in #2853 , will merge this soon