* fix other binaries (s390-zipl, ppc_rom)

* permissions/ownership for /dev/vhost_net???

* startup script for qemu-guest-agent: check dependencies & runlevels.

* maybe provide activation for udev & systemd:

   SUBSYSTEM=="virtio-ports", ATTR{name}=="org.qemu.guest_agent.0", \
     TAG+="systemd" ENV{SYSTEMD_WANTS}="qemu-guest-agent.service"

  and dev-virtio/ports-org.qemu.guest_agent.0.device activation
  for systemd.

* decide what to do with qemu-bridge-helper (#691138)