Cleanup of playbooks.

- Set the become parameters in the inventory instead of adding it to all
  of the playbooks.
- Can't group by the package manager in the bootstrap playbook, can'
  gather facts, that's why the bootstrap is needed. Hard-code hosts.
- Delete the toolbox playbook, add the toolbox role to the debian_server
  playbook.
- Update list of playbooks in the pre-commit config.