Arvados

Both of these features were prototypes to simplify the install process. They never got developed far enough to become fully supported processes, and at this point, we would rather invest our efforts into Ansible playbooks.

Remove both these features. arvados-package was purely an internal tool so it can go away wholesale. It might be a nice affordance if arvados-server install pointed you to documentation with newer methods, and then exited with an error.

Don't forget to remove arvados-package test and build stuff from the build directory.