[SPARK-31791][CORE][TEST] Improve cache block migration test reliability#28614

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holdenk:SPARK-31791-improve-cache-block-migration-test-reliability

Commits on May 22, 2020

Attempt to fix the WorkerDecommissionSuite in core
holdenk
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Waiting for the task to start is not enough to gaurantee that we've reached the point in the scheduling, make the task take slightly longer and wait an extra two seconds for scheduling to run it's …
holdenk
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