Add other static system users

Our setup is so that all the system users are created at image build
time; since each image build needs to retain the same user IDs, for
compatibility with OSTree upgrades, we have to ship a whole static list
of system users and groups.
Add systemd-journal group
Add geoclue group and user
Add speech-dispatcher user
Don't autogenerate version from changelog

We are going to separate debian packaging to a separate dir.