[ZEPPELIN-4600] Socket connection between zeppelin server and interpreter is not closed properly for master branch #3653
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What is this PR for?
Fix the stability problem of zengin for long time (7day) loop working ,
release the thread pools and socket connection when the interprether is closed
What type of PR is it?
[Bug Fix ]
Todos
What is the Jira issue?
https://issues.apache.org/jira/browse/ZEPPELIN-4600
How should this be tested?
Screenshots (if appropriate)
Questions: