Add test case for POST with no Content-Type header
Add test case for POST with no Content-Type header

Signed-off-by: Matt Benjamin <b5ea062884a8f3dc969ff57d1008615447c56296@redhat.com>

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