fix duplicate auth_token in development database images (PR #532)

This pull request fixes some bugs caused by duplicate auth_token in developer db images. lookup_from_auth_token selects the first user with an auth_token. One bug to reproduce is this:

  1. import the database from development-image.sql
  2. login as eviltrout:password
  3. go to /message-bus/_diagnostics
  4. you get “not allowed”

I think the best way is not to include any auth_token in the db dump, so it will be recreated at login.


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