As part of open sourcing the software product, we should consider that
loyalty points are not the best language. Switching to "credits" makes
sense from a lot of points of view.
At the same time, this change allows an achitectural change towards
slots. Slots allow daemon resources to get booked based on the HW ratio
configured in the daemon config.
fix authentication and refund on delete vm
refactor app daemon register to get delete app req
db function for delete app
sample environment variable
extensive tests for delete app and vm
refactor test utilities
