bootstrap.py fails if buildout uses a pinned buildout
When calling buildout, he tries repeatetly to get distribute. He finds it but wants to get it again after that.
The problem dissappears when not pinning buildout.
With pinning, I started out with buildout 1.4.1. During buildout process, buildout got buildout 1.2.1 and restartet itself. Maybe this is correlated.