ajorgensen opened a new pull request #2864: S3Uploader improvements
URL: https://github.com/apache/incubator-heron/pull/2864
   This fixes 2 bugs in the S3Uploader.
   The first is when setting the region it is not checked before-hand if
   the region is set or not. In the event that the end user does not
   explicitly set the region in the config it will automatically be set to
   `null`. Since `null` is not a valid s3 region the uploader will fail
   with a 301 on any command which can be confusing. It is not required
   that the s3 client sets a region and in the event that one is not set
   explicitly it will default to us-east-1.
   The second is the `close` method does not check to see if the file
   exists before it deletes it. In the event that there is a failure
   earlier in the uploading process the `previousVersionFilePath` will
   exist but was never uploaded to s3 and the `close` method will throw
   an exception.

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