The use of SystemExit exceptions in what is effectively library code
has been eliminated. A new exception is introduced and it is handled
with a translation to a SystemExit within generate.py when
appropriate.
When attempting to load an existing inventory, a tuple is returned
instead of simply the inventory. The tuple includes the path used to
load the inventory, or an appropriate path. This facilitates saving
to the correct place with save_inventory later.
Use of dir_find within generate.py was also eliminated and the logic
around path to configuration should be simpler now.
One debug logging message was adjusted to only run when the desired
file is actually loaded, where it was always trying to log a message
even if not file was found previously.
The manage.py file had imports updated to replicate the pattern used
in generate.py
Change-Id: I9caecfa09517a508882ae491df9e3d2da9386012
Parent-Id: I577cdbf4aadfcce846412edd7e2a394c257c0243
5cde716959