Remove config dependency injection

[briehl]

Right now this exists:

staging_service/staging_service/app.py

Lines 669 to 671 in 508492c

	Path._DATA_DIR = DATA_DIR
	Path._META_DIR = META_DIR
	Path._CONCIERGE_PATH = CONCIERGE_PATH

Which puts configured values as class variables in the utils.Path class. And that's... a little weird.

This needs a refactor to provide path information that works with the configured values, and not with some class injection.