* open-vm-tools package, vmtoolsd.service and vmware-vmblock-fuse.service for VMware.
* hyperv package, hv_fcopy_daemon.service, hv_kvp_daemon.service and hv_vss_daemon.service for Hyper-V.
Related to #118.
* virtualbox-guest-utils-nox package and vboxservice.service for VirtualBox.
* qemu-guest-agent package and qemu-guest-agent.service for QEMU & libvirt.
Implements #118.
configs/releng/airootfs/etc/systemd/system/multi-user.target.wants/iwd.service:
Adding a symlink to /usr/lib/systemd/system/iwd.service to enable iwd in
airootfs (and thus on the image).
Closes#18