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When a bucket already exists, PUT returned a BucketAlreadyExists error. AWS S3 returns BucketAlreadyOwnedByYou error instead, so this changes the error returned by swift3. When sending a PUT request to a bucket, if the bucket already exists and is not owned by the user, return 409 conflict error, BucketAlreadyExists. Change-Id: I32a0a9add57ca0e4d667b5eb538dc6ea53359944 Closes-Bug: #1498231