python-zopeinterface-3.5.1: fix packaging

python-zopeinterface-3.5.1: fix packaging

* Inherit setuptools instead of distutils.

  Install paths with distutils (built on x86_64 for mipsel):
  usr/lib/python2.6/site-packages/zope.interface-3.5.1-py2.6-linux-x86_64.egg/zope/interface/*.py

  Install paths with setuptools:
  usr/lib/python2.6/site-packages/zope/interface/*.py

* Package tests into ${PN}-tests.
* Package .c files into ${PN}-dev.
* Package .txt files into ${PN}-doc.
* oe-stylized.

Signed-off-by: Andreas Oberritter <obi@opendreambox.org>
CC: Michael 'Mickey' Lauer <mlauer@vanille-media.de>
Signed-off-by: Khem Raj <raj.khem@gmail.com>