[Python-legal-sig] Making it possible to accept contributions without CLA

[anatoly techtonik]

node.js dropped CLA and Python should do the same.
https://www.joyent.com/blog/broadening-node-js-contributions

> The PSF needs to be able to defend the IP rights in Python

PSF could handle such issues on a case by case basis. If it
chooses to generalize it then I read it as mistrust in
contributors. If it mistrusts me, why I should trust it? It is a
wrong way.