v4 authentication - aws-chunked upload [JIRA: RCS-115]

[Basho-JIRA]

• Investigate which client/SDK supports aws-chunked uploads
  • Java SDK implements aws-chunked
    https://github.com/aws/aws-sdk-java/blob/master/aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/internal/AWSS3V4Signer.java#L53
• Authorization header / aws-chunked / no tranfer encoding case
  • Content-Length header does not represent object size, how to know/compute?
  • s3cmd and boto do not implement this.
• Authorization header / aws-chunked / chunked tranfer encoding case
  • No Content-Length header, c-l will be determined after transfer?
• Access stats log for chunked upload
  • there are possibly three kinds of length: HTTP request payload, HTTP Content-Length, Object size