To make testing of the frontend easier, we add a script that generates
Person objects with the appropriate Consents and Identities for the
different stages of the registration process. This includes Invitations,
InvitationLinks, Sponsors and other things that would be present in a
production environment.

Resolves:  GREG-93

- Rename management command start_notification_publisher to notification_publisher
- Rename management command start_schedule_tasks to task_scheduler
- Stop using python-daemon and lockfiles, as these will run as standalone containers anyway
- Remove management commands stop_notification_publisher and stop_schedule_tasks
- Remove python-daemon dependency

README said to use the default django command, but that does not work
with the current setup. The file has been updated to run pytest and a
pytest.ini file with the basic info needed to run the tests is now
included.