Make it able to delete addresses that are no longer in the netns config.
Also make it read one netns-base.json for hardware config which is
managed by puppet but also make it look for netns-sunet-cdn-agent.json
which is not created by puppet. This file will be generated by
sunet-cdn-agent and will include the configuration for dummy0.
Trying to run goose for creating database contents failed:
```
2024/11/14 11:59:13 goose run: failed to ensure DB version: ERROR: permission denied for schema public (SQLSTATE 42501)
```
This seems to be because PostgreSQL 15 removed the default CREATE
permission in the public schema for users other than the database owner.
Instead we create a user-specific schema owned by that same user and
leave the public schema unused.
Without this the commands will hang for input to select a provisioner.
This is needed now that we have enabled a second (the ACME) provisioner
on init.
This is to deal with the problem that it makes sense to have a separate
passsword for encryption keys and the admin provisioner. It is currently
not possible to control this via the docker env flags so add this
workaround for now.
