Issue #229: Bad File Descriptor (conservancy/kallithea)

[Tony Bussieres]

New issue 229: Bad File Descriptor
https://bitbucket.org/conservancy/kallithea/issues/229/bad-file-descriptor

Tony Bussieres:

Happens from time to time and it shuts down kallithea

Using kallithea 0.3.2 on Ubuntu 16.04 LTS
```
2016-07-07 02:27:01.500 INFO  [kallithea.RequestWrapper] IP: 192.168.20.1 Request to /XXXX/YYYYYYY/ time: 0.213s
Traceback (most recent call last):
  File "/usr/local/bin/paster", line 9, in <module>
    load_entry_point('PasteScript', 'console_scripts', 'paster')()
  File "/Kallithea-0.3.2/.eggs/PasteScript-2.0.2-py2.7.egg/paste/script/command.py", line 102, in run
    invoke(command, command_name, options, args[1:])
  File "/Kallithea-0.3.2/.eggs/PasteScript-2.0.2-py2.7.egg/paste/script/command.py", line 141, in invoke
    exit_code = runner.run(args)
  File "/Kallithea-0.3.2/.eggs/PasteScript-2.0.2-py2.7.egg/paste/script/command.py", line 236, in run
    result = self.command()
  File "/Kallithea-0.3.2/.eggs/PasteScript-2.0.2-py2.7.egg/paste/script/serve.py", line 319, in command
    serve()
  File "/Kallithea-0.3.2/.eggs/PasteScript-2.0.2-py2.7.egg/paste/script/serve.py", line 303, in serve
    server(app)
  File "/Kallithea-0.3.2/.eggs/PasteDeploy-1.5.2-py2.7.egg/paste/deploy/loadwsgi.py", line 189, in server_wrapper
    **context.local_conf)
  File "/Kallithea-0.3.2/.eggs/PasteDeploy-1.5.2-py2.7.egg/paste/deploy/util.py", line 55, in fix_call
    val = callable(*args, **kw)
  File "/usr/local/lib/python2.7/dist-packages/waitress-0.8.8-py2.7.egg/waitress/__init__.py", line 21, in serve_paste
    serve(app, **kw)
  File "/usr/local/lib/python2.7/dist-packages/waitress-0.8.8-py2.7.egg/waitress/__init__.py", line 18, in serve
    server.run()
  File "/usr/local/lib/python2.7/dist-packages/waitress-0.8.8-py2.7.egg/waitress/server.py", line 154, in run
    use_poll=self.adj.asyncore_use_poll,
  File "/usr/lib/python2.7/asyncore.py", line 216, in loop
    poll_fun(timeout, map)
  File "/usr/lib/python2.7/asyncore.py", line 145, in poll
    r, w, e = select.select(r, w, e, timeout)
select.error: (9, 'Bad file descriptor')
```