s3: add a test script verifying the new v4 cheksum enforcement

Abhishek Lekshmananrequested to merge
awsv4-xsum into master

This script tests with both server and client side fixes. Once the server side allows for v4 checksum, the full suite should be green

Signed-off-by: Abhishek Lekshmanan abhishek.lekshmanan@cern.ch

Merge request reports