...at least, provided the client sent a X-Amz-Content-SHA256 header.
Apparently Content-MD5 is no longer strictly required by AWS? Or maybe
it never was, provided the client sent a SHA256 of the content.
This also allows us to test with newer boto3, botocore, s3transfer.
Related-Bug: #2098529
Co-Authored-By: Clay Gerrard <clay.gerrard@gmail.com>
Change-Id: Ifbcde9820bee72d80cab0fe3e67ea0f5817df949