Add a suitable test config for the daemon

In service of more repeatable testing and improved feature coverage,
include a test fixture for a version of the normal sample
configuration with some additional non-default features enabled and
some settings tuned to values which make testing easier/faster (not
recommended for production use):

* allow "testuser" to automatically be an admin when created

* enable data backup copies but keep only 3 when rotating

* turn on file-backed logging

* background the daemon process once initialized

* write a pidfile

* inject status updates into logs every 25 ticks

* save and rotate datafiles every 5 ticks