Changed s3tests to run off "branch: giant-noreason" per Yehuda's fix for #9169

Signed-off-by: Yuri Weinstein <yuri.weinstein@inktank.com>
Merge pull request #213 from ceph/wip-s3tests-branch

Changed s3tests to run off "branch: giant-noreason" per Yehuda's fix for #9169