Aditya Manthramurthy f1355da72e Add base64 encoded MD5 output for Hash Reader (#5315)
- Use it to send the Content-MD5 header correctly encoded to S3
  Gateway

- Fixes a bug in PutObject (including anonymous PutObject) and
  PutObjectPart with S3 Gateway found when testing with Mint.
2017-12-21 17:27:33 -08:00
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