HADOOP-16085 S3Guard versioning (stevel patch 002)#807

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steveloughran wants to merge 5 commits intoapache:trunkfrom

steveloughran:s3/HADOOP-16085-s3guard-versioning

Commits on May 2, 2019

Squashed commit of the following:
Ben Roling
committed

Commits on May 8, 2019

Retries for eventually consistent read-after-overwrite
Ben Roling
committed
HADOOP-16085 S3Guard to support version tracking
steveloughran
committed
Fix test failures when bucket versioning disabled
Ben Roling
committed

Commits on May 9, 2019

HADOOP-16085-steve-patch-002
steveloughran
committed