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>

.gitignore

@@ -67,6 +67,9 @@ freeipa2-dev-doc
 
 /ipatests/setup.py
 
+/ipalib/setup.py
+!/ipalib/Makefile
+
 /ipapython/setup.py
 /ipapython/version.py
 !/ipapython/Makefile