HIVE-23210: Update ShortestJobFirstComparator #984
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Update ShortestJobFirstComparator to take into account single-task vertices.
Single-task vertices with earlier start-time have higher priority, while the ones with the latest start-times are the first candidates for eviction.
Change-Id: I94715d194ec8b3a6919aa56d4fae8a0b529ae23e