04100cd281
Previously you would be able to override only the QEMU package to be used in the test runner. Frankly that doesn't help a lot if you are trying to get a graphical session. The graphical session requires the option in the NixOS module system to bet set to the correct QEMU package. In this commit I moved most of the test node configuration and transformations into the `mkDriver` function (previously called `driver`). The motivation was to be able to create a `driver` instance with a given QEMU package that will be used consistently througout the test expression.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.