[FLINK-18247][table-planner-blink] Fix unstable test: TableITCase.testCollectWithClose

[godfreyhe]

What is the purpose of the change

The reason is after calling CloseableIterator#close to cancel job in TableITCase.testCollectWithClose method, the job status may be CANCELED, CANCELING or even the MiniCluster maybe already been shut down. An exception will be thrown when MiniCluster is down. This pr aims to fix the unstable case.

Brief change log

• Change the getting jobStatus logic and jobStatus checking logic in TableITCase.testCollectWithClose

Verifying this change

This change is already covered by existing tests.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (yes / no)
• The serializers: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): (yes / no / don't know)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (yes / no / don't know)
• The S3 file system connector: (yes / no / don't know)

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

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Automated Checks

Last check on commit 9e43454 (Thu Jun 11 07:54:12 UTC 2020)

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[JingsongLi]

This also catch exception of assertNotEquals and makes assertNotEquals useless.

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CI report:

• e32a32b UNKNOWN
• c44353a Azure: FAILURE

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[JingsongLi]

Looks good to me.