Fix issues with installing sdist and wheels

Fix issues with installing sdist and wheels

A local install of the sdist and wheel found the following issues:

- sdist: Add MANIFEST.in to include missing README.md, LICENSE,
  anteater.conf, master_list.yaml, and explicitly exclude exception
  files.
- sdist: Both py_modules and packages listed. Since Anteater is a Python
  package, not a module, only the 'packages' argument is required for
  setup().
- wheel: 'REQUIRES' in setup.py is missing dependent packages

JIRA: RELENG-275

Change-Id: I3b1447edcd7161cda4c5d581e31019bcf8eba1c8
Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>