add virtio rsyslogd logging to anaconda
    
    Before noloader this was handled by loader. It detects a specific virtio
    path (org.fedoraproject.anaconda.log.0) and restarts rsyslogd to pass
    logs to the host via virtio. If the path doesn't exist this has no
    effect.
    
    This also switches to using systemctl to restart rsyslogd since
    HUP no longer works as of v5.