Recurring travis fail `no such option 'with-pylons'`

For example in https://travis-ci.org/okfn/ckan/jobs/6243730

```
[formatter_generic]
format = %(asctime)s %(levelname)-5.5s [%(name)s] %(message)s
/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/nose/plugins/manager.py:395: RuntimeWarning: Unable to load plugin main = ckan.ckan_nose_plugin:CkanNose: No module named paste.deploy
  RuntimeWarning)
Traceback (most recent call last):
  File "/home/travis/virtualenv/python2.7/bin/nosetests", line 9, in <module>
    load_entry_point('nose==1.2.1', 'console_scripts', 'nosetests')()
  File "/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/nose/core.py", line 118, in __init__
    **extra_args)
  File "/usr/lib/python2.7/unittest/main.py", line 94, in __init__
    self.parseArgs(argv)
  File "/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/nose/core.py", line 135, in parseArgs
    self.config.configure(argv, doc=self.usage())
  File "/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/nose/config.py", line 276, in configure
    options, args = self._parseArgs(argv, cfg_files)
  File "/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/nose/config.py", line 264, in _parseArgs
    return parser.parseArgsAndConfigFiles(argv[1:], cfg_files)
  File "/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/nose/config.py", line 132, in parseArgsAndConfigFiles
    self._applyConfigurationToValues(self._parser, config, values)
  File "/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/nose/config.py", line 118, in _applyConfigurationToValues
    name=name, filename=filename)
  File "/home/travis/virtualenv/python2.7/local/lib/python2.7/site-packages/nose/config.py", line 261, in warn_sometimes
    raise ConfigError(msg)
nose.config.ConfigError: Error reading config file 'setup.cfg': no such option 'with-pylons'
```