This adds support for the mkosi switch --without-tests that is
introduced by:
https://github.com/systemd/mkosi/pull/122
With this in place doing "mkosi -ifT shell" is the fastest way from a
git clone to a shell within a freshly compiled systemd system.
This adds a build script and a settings file for "mkosi", a tool for putting
together full, bootable disk images for container managers of EFI systems and
VMs.
With these files it's enough to type "mkosi" in the project directory to
generate a bootable Fedora 24 OS image with a version of systemd compiled fresh
from the working tree.
See https://github.com/systemd/mkosi