scrub database dump: herokudump.py cmd

[odo-sfct]

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Run the command as:
heroku login
python manage.py herokudump iwalk-test
inside the server container with Django server up.
Where iwalk-test can be -staging or prod

It'll download the appropriate database and scrub it before restoring the local dump.
It works with you current as it runs a pg_restore with a clean, so it'll overwrite the data you have currently.
Best practice is do drop what you have locally first to get a clean slate, but it's been built so that it's not necessary.

There will be use cases where you would not want to scrub:

• Testing specific migrations on exact emails/names
• Running queries using those emails/names locally

Since that occasion is rarer, we leave that process to be manual.