remove(dev-lang/python): This moved to portage-stable a while ago.
add(dev-lang/python-oem): create a minimal python for OEM

A number of cloud agents are written in python. Install a basic python
to /usr/share/oem/python with this ebuild.
fix(dev-lang/python-oem): cleanups and fixes for OEM python

Remove all RDEPENDS, OEM packages are installed after prod images are
pruned of the previously installed package database.

Re-enable XML and ctypes support since the required libraries happen to
be bundled with Python.

Assorted other simplifications.
fix(coreos-devel/board-packages): Build python-oem with build_packages
Merge pull request #506 from marineam/oem

Python for OEM