This PR adds the post-installation section that adds a file
in the /home space, which then can be checked by a `preserve_home`
post-installation test and prove that it was possible to
preserve home on btrfs layouts.
This commit adds support for boot options, that can be passed
from `hdds.json` to control the creation of the virtual
machines, such as enabling of EFI based machines, boot order
control, etc. It also adds EFI based machine to `hdds.json`
and adds a kickstart file for such machine.
Adam Williamson
Lukáš Růžička