rules test target:  add $(debian) & $(maintainer)

$(debian) becomes the add-on module packages' release

$(maintainer) is embedded in packages
Force package revision to be read from changelog

This allows kern pkg revision to be passed into the add-on modules,
avoiding having to keep track manually, avoiding setting
DEBIAN_REVISION= in the environment, and avoiding a horrible generated
revision
rules:  'echo' statements invisible for cleaner output