Removed C athinfod

Removed athinfod.c and supporting build infrastructure.
Added Python athinfod

Added athinfod.py to replace athinfod.c and related infrastructure
Implemented athinfod.defs support

Added support for loading *.defs files from
/etc/athena/athinfo.defs.d.
Addressed review comments
Addressed comments
Rename script; add setup.py

- Rename athinfod.py to athinfod, since both distutils and dh are
  incapable of renaming files while installing them, even in 2014.
- Add a setup.py for the aforementioned distutils
Remove Debian packaging from master