Use setuptools <34

zc.buildout >= 2.5.3 is required to use newer versions.

This change is required to setup a test environment for this branch.

buildout.cfg

@@ -4,6 +4,7 @@ parts = test oltest py
 versions = versions
 
 [versions]
+setuptools = 33.1.1
 zope.interface = 4.1.3
 zope.exceptions = 4.0.8
 zc.recipe.testrunner = 2.0.0