Nova-manage enables user to delete projects by using nova-manage project delete.

Judging from the code, in sqlalchemy/api.py, it removes information in user_project_association and user_project_role_association.

Should the user take a step before that, i.e. using nova-manage project scrub, it will remove networks and security groups. However, it still doesn't clean up quota, and iptables in both network controller and compute nodes.

So, is there any best of practice available to resolve this issue?