packet23 opened a new pull request #6540: [FLINK-9891] Added hook to shutdown 
cluster if a session was created in per-job mode.
   ## What is the purpose of the change
   Change minimizes probability of a per-job yarn session cluster surviving 
after client exited. It restores the Flink 1.4 and below cli behaviour.
   ## Brief change log
     - when per-job yarn cluster is deployed, a shutdown hook installed
     - when shutdown hook is called, it terminates the deployed cluster
     - when cli terminates normally, shutdown hook is called by cli and 
     - otherwise, java runtime will call shutdown hook
   ## Verifying this change
   We verified the change manually by submitting a DataSet API application to 
Yarn and killing client before job terminated.
   ## Does this pull request potentially affect one of the following parts:
     - Dependencies (does it add or upgrade a dependency): no
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: no
     - The serializers: no
     - The runtime per-record code paths (performance sensitive): no
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: no
     - The S3 file system connector: no
   ## Documentation
     - Does this pull request introduce a new feature? no
     - If yes, how is the feature documented? not documented

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