For RBTools 5 and up, we'll be using our new housekeeping module to

manage our deprecations, giving us better tools and reducing what we

have to manage.
All the classes in rbtools.deprecation now use housekeeping base

classes, and old utilities are now removed.
Deprecated code has been updated to use housekeeping. These will be

removed at some point during release, but as we'll be working with

vendors to test some functionality in RBTools 5 soon, we don't want to

risk immediate breakages.

Unit tests pass.