Package ipapython, ipalib, ipaplatform, ipatests for Python 3

Running make with PYTHON=/usr/bin/python3 will build/install the
bits for Python 3.

Executable scripts in ipatests have symlinks Python version suffixes
as per Fedora guidelines. Suffix-less names point to the Python 2 versions.

Reviewed-By: Jan Cholasta <jcholast@redhat.com>

setup.py

@@ -75,8 +75,6 @@ setup(
     license='GPLv3+',
     url='http://freeipa.org/',
     packages=[
-        'ipalib',
-        'ipalib.plugins',
         'ipaserver',
         'ipaserver.advise',
         'ipaserver.advise.plugins',