rgw: skip aws2 requests when testing aws4
rgw: skip aws2 requests when testing aws4

Signed-off-by: Yehuda Sadeh <48638f9c2a62c4fd20be28d0bdad68f5cd041402@redhat.com>

jmunhoz/s3-tests,andrewgaul/s3-tests,andrewgaul/s3-tests,jmunhoz/s3-tests,robbat2/s3-tests,ceph/s3-tests,timuralp/s3-tests,robbat2/s3-tests,ceph/s3-tests,timuralp/s3-tests