monitor: Convert do_info_balloon() to QObject On success return a QInt with the balloon's value. This also introduces monitor_print_balloon() to print the balloon information in the user protocol. Please, note that errors are not being converted yet. Patchworks-ID: 35351 Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>