Vagrantfile:
- Split provisioning script into two steps: root-level commands and user-level (user:vagrant) commands.
- Create separate script files for ilastik build and ilastik tests, which can be run manually via ssh.
- Renamed vm hostname to ilastikci
- Enable port forwarding from host:8022 -> ilastikci:22 for ssh (in case default 2222 -> 22 is not available on host)
- Configure VM with 4 CPUs.