[SPARK-26371][SS] Increase kafka ConfigUpdater test coverage.#23321

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gaborgsomogyi:SPARK-26371

Commits on Dec 14, 2018

Commits on Dec 15, 2018

Review fixes
gaborgsomogyi
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Commits on Dec 17, 2018

Created KafkaDelegationTokenTest and moved delegation token related common logic there
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