tests: Add capabilities for QEMU 4.0.0 on s390x

tests: Add capabilities for QEMU 4.0.0 on s390x

In addition adjusting iothreads-virtio-scsi-ccw.s390x-latest.args to prevent
accidential drive id exposure by QEMU fixed by commit a1dce96236f
(qemu: Use the 'device_id' property of SCSI disks to avoid regressing),
and also adjusting *s390x-latest.args files to qemu deprecation changes made
in commit e8c2c8bd078 (Prefer '-overcommit mem-lock' over -realtime mlock').

Signed-off-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>