python: setuptools namespaces are broken (give collisions) #2412
Description
Since bf5d6fb, any combination of packages using setuptools namespaces are broken due to the fact we're not using eggs anymore. Since packages have the same path, they collide.
For example:
collision between `/nix/store/j52ga0vwgrjh607ql4kcs4mwnm4rkhjc-python2.7-logilab-astng-0.24.3/lib/python2.7/site-packages/logilab/__init__.py' and `/nix/store/dqsy6a2nv09j7hcv2a300q6392zbry0z-python2.7-logilab-common-0.61.0/lib/python2.7/site-packages/logilab/__init__.py' at /nix/store/9z6d76pz8rr7gci2n3igh5dqi7ac5xqj-builder.pl line 72.