HADOOP-16085: use object version or etags to protect against inconsistent read after replace/overwrite#794

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ben-roling wants to merge 13 commits intoapache:trunkfrom

ben-roling:HADOOP-16085-squashed-2

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

Commits on May 10, 2019

Fix testRenameEventuallyConsistentDirectory failures
Ben Roling
committed
Remove layered retries in copyFile() and select()
Ben Roling
committed
qualify versionId on GetObjectMetadataRequest
Ben Roling
committed

Commits on May 13, 2019

Fix handling around inconsistency during rename
Ben Roling
committed
Use SdkBaseException instead of Exception
Ben Roling
committed

Commits on May 16, 2019

HADOOP-16085: S3Guard versioning: get ITestS3ARemoteFileChanged to work consistently
steveloughran
committed

Commits on May 17, 2019