Added tests for HEAD method for encrypted objects.
Added tests for HEAD method for encrypted objects.

Signed-off-by: Adam Kupczyk <12d5d81dfef51808bf7826725c259bc35ee127a7@mirantis.com>

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