HADOOP-17318. Support concurrent S3A commit jobs with same app attempt ID.#2399

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steveloughran wants to merge 3 commits intoapache:trunkfrom

steveloughran:s3/HADOOP-17318-magic-abort

Commits on Nov 12, 2020

HADOOP-17318. Support concurrent S3A jobs with conflicting app attempt IDs
steveloughran
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Commits on Nov 16, 2020

HADOOP-17318: address feedback.
steveloughran
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Commits on Nov 17, 2020

HADOOP-17318. Checkstyles before the merge
steveloughran
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