[SPARK-30345][SQL] Fix intermittent test failure (ConnectException) on ThriftServerQueryTestSuite/ThriftServerWithSparkContextSuite#27001

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HeartSaVioR:SPARK-30345

Commits on Dec 24, 2019

[SPARK-30345][SQL] Fix intermittent test failure (ConnectException) on ThriftServerQueryTestSuite/ThriftServerWithSparkContextSuite
HeartSaVioR
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Commits on Dec 26, 2019

Address review comments
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