Six requires setuptools

[vbraun]

Build time race:

Traceback (most recent call last):
  File "setup.py", line 4, in <module>
    from setuptools import setup
  File "build/bdist.linux-x86_64/egg/setuptools/__init__.py", line 12, in <module>
  File "build/bdist.linux-x86_64/egg/setuptools/extension.py", line 7, in <module>
  File "build/bdist.linux-x86_64/egg/setuptools/dist.py", line 17, in <module>
  File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 2817, in <module>
  File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 440, in _build_master
  File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 433, in __init__
  File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 489, in add_entry
  File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 1817, in find_eggs_in_zip
  File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 1782, in __init__
  File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 1545, in build_zipmanifest
  File "/mnt/SSD1/mod_buildslave/sage_git/build/local/lib/python/zipfile.py", line 756, in __init__
    self.fp = open(file, modeDict[mode])
IOError: [Errno 2] No such file or directory: '/mnt/SSD1/mod_buildslave/sage_git/build/local/lib/python2.7/site-packages/setuptools-3.6-py2.7.egg'
Error installing six ... exiting

CC: @kiwifb

Component: packages: standard

Author: Volker Braun

Branch/Commit: 5538c7d

Reviewer: François Bissey

Issue created by migration from https://trac.sagemath.org/ticket/18202

[vbraun]

Branch: u/vbraun/six_requires_setuptools

[vbraun]

New commits:

5538c7d

Add setuptools to the six dependencies

[vbraun]

Author: Volker Braun

[vbraun]

Commit: 5538c7d

[kiwifb]

comment:3

That's very strange. I am guessing it's happening during an upgrade, this is from six's setup.py

try:
    from setuptools import setup
except ImportError:
    from distutils.core import setup

So we should have a nice fallback. Oh I get it "race condition" so setuptool is removed while you are using it. Yeah that will fix that.

[kiwifb]

Reviewer: François Bissey

[vbraun]

Changed branch from u/vbraun/six_requires_setuptools to 5538c7d