monitor: Convert do_info_version() to QObject The returned data is always a QString. Also introduces monitor_print_qobject(), which can be used as a standard way to print QObjects in the user protocol format. Patchworks-ID: 35350 Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>