setuptools upgrade breaks funcsigs test runner

Originally reported by: FRidh (Bitbucket: FRidh, GitHub: FRidh)

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I'm testing on Nix to update from setuptools 19.4 to the latest 20.0.
This seems to break funcsigs test runner (with CPython 2.7 and PyPy, not CPython 3.x).

I don't know whether this is a setuptools or funcsigs issue, but since it broke due to a setuptools upgrade I'm posting it here.

Wheels version is 0.29.0 and pip 8.0.2

Traceback (most recent call last):
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "build/bdist.linux-x86_64/egg/setuptools/launch.py", line 35, in <module>
  File "build/bdist.linux-x86_64/egg/setuptools/launch.py", line 31, in run
  File "setup.py", line 54, in <module>
    test_suite = "tests" if sys.version_info[0] > 2 else 'unittest2.collector'
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/distutils/core.py", line 151, in setup
    dist.run_commands()
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/distutils/dist.py", line 953, in run_commands
    self.run_command(cmd)
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/distutils/dist.py", line 972, in run_command
    cmd_obj.run()
  File "build/bdist.linux-x86_64/egg/setuptools/command/test.py", line 159, in run
  File "build/bdist.linux-x86_64/egg/setuptools/command/test.py", line 140, in with_project_on_sys_path
  File "build/bdist.linux-x86_64/egg/setuptools/command/test.py", line 180, in run_tests
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/unittest/main.py", line 94, in __init__
    self.parseArgs(argv)
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/unittest/main.py", line 149, in parseArgs
    self.createTests()
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/unittest/main.py", line 158, in createTests
    self.module)
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/unittest/loader.py", line 130, in loadTestsFromNames
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/unittest/loader.py", line 115, in loadTestsFromName
    test = obj()
  File "/nix/store/vchwq7njpf8aim7y30yyyxrp4l2h0j52-python2.7-unittest2-1.1.0/lib/python2.7/site-packages/unittest2/collector.py", line 9, in collector
    return defaultTestLoader.discover(setupDir)
  File "/nix/store/vchwq7njpf8aim7y30yyyxrp4l2h0j52-python2.7-unittest2-1.1.0/lib/python2.7/site-packages/unittest2/loader.py", line 364, in discover
    raise ImportError('Start directory is not importable: %r' % start_dir)
ImportError: Start directory is not importable: '/nix/store/3ykhlhc5mg0q28hwn9csbqlpz4xwfjrv-python2.7-setuptools-20.0/lib/python2.7/site-packages/setuptools-20.0-py2.7.egg/setuptools'

Possibly related are (vobject)

Traceback (most recent call last):
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "build/bdist.linux-x86_64/egg/setuptools/launch.py", line 35, in <module>
  File "build/bdist.linux-x86_64/egg/setuptools/launch.py", line 31, in run
  File "setup.py", line 121, in <module>
    'testing': TESTS_REQUIRE + ['nose', 'coverage'],
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/distutils/core.py", line 151, in setup
    dist.run_commands()
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/distutils/dist.py", line 953, in run_commands
    self.run_command(cmd)
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/distutils/dist.py", line 972, in run_command
    cmd_obj.run()
  File "build/bdist.linux-x86_64/egg/setuptools/command/test.py", line 159, in run
  File "build/bdist.linux-x86_64/egg/setuptools/command/test.py", line 140, in with_project_on_sys_path
  File "build/bdist.linux-x86_64/egg/setuptools/command/test.py", line 180, in run_tests
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/unittest/main.py", line 94, in __init__
    self.parseArgs(argv)
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/unittest/main.py", line 149, in parseArgs
    self.createTests()
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/unittest/main.py", line 158, in createTests
    self.module)
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/unittest/loader.py", line 130, in loadTestsFromNames
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/unittest/loader.py", line 100, in loadTestsFromName
    parent, obj = obj, getattr(obj, part)
AttributeError: 'module' object has no attribute 'alltests'

and (zope.schema, all Python versions)

Traceback (most recent call last):
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "build/bdist.linux-x86_64/egg/setuptools/launch.py", line 35, in <module>
  File "build/bdist.linux-x86_64/egg/setuptools/launch.py", line 31, in run
  File "setup.py", line 74, in <module>
    setup(**options)
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/distutils/core.py", line 151, in setup
    dist.run_commands()
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/distutils/dist.py", line 953, in run_commands
    self.run_command(cmd)
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/distutils/dist.py", line 972, in run_command
    cmd_obj.run()
  File "build/bdist.linux-x86_64/egg/setuptools/command/test.py", line 159, in run
  File "build/bdist.linux-x86_64/egg/setuptools/command/test.py", line 140, in with_project_on_sys_path
  File "build/bdist.linux-x86_64/egg/setuptools/command/test.py", line 180, in run_tests
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/unittest/main.py", line 94, in __init__
    self.parseArgs(argv)
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/unittest/main.py", line 149, in parseArgs
    self.createTests()
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/unittest/main.py", line 158, in createTests
    self.module)
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/unittest/loader.py", line 130, in loadTestsFromNames
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/nix/store/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11/lib/python2.7/unittest/loader.py", line 100, in loadTestsFromName
    parent, obj = obj, getattr(obj, part)
AttributeError: 'module' object has no attribute 'alltests'

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• Bitbucket: https://bitbucket.org/pypa/setuptools/issue/493