Only seed database for Debian install if we're using default config

Only seed database for Debian install if we're using default config

  If the user changes the config away from DB4 or the default DB
  directory and deletes the old directory we'll think they don't
  have an initialised key database and try to seed it with my key.
  Check the config file and if it doesn't match what we expect
  assume the user has configured appropriately and don't seed the DB.