Comment 13 for bug 633640

In one word: ugly :)

I could live with it if it was going to be just a short-lived workaround but as I suspect we (and everybody else so much as thinking of python 2 -> 3 transition) are going to need parallel python 2 and 3 stacks for a long long time, I think we need to figure out something that's sanely upstreamable.

Which probably means the python module build needs to be separated from the rest of the rpm, so that for a setup like this you can
1) configure rpm at top level tree to build without python
2) build + install rpm itself
3) do 'cd python' and then build + install with whatever python versions are wanted