Issue #317: Operation not supported. (conservancy/kallithea)

[wisekaa03]

New issue 317: Operation not supported.
https://bitbucket.org/conservancy/kallithea/issues/317/operation-not-supported

wisekaa03:

```
Error - <type 'exceptions.IOError'>: [Errno 45] Operation not supported
URL: http://git.kngk.org/
File '/usr/local/lib/python2.7/site-packages/weberror/errormiddleware.py', line 171 in __call__
  app_iter = self.application(environ, sr_checker)
File '/usr/local/lib/python2.7/site-packages/kallithea/lib/middleware/sessionmiddleware.py', line 62 in __call__
  return self.wrap_app(environ, session_start_response)
File '/usr/local/lib/python2.7/site-packages/routes/middleware.py', line 131 in __call__
  response = self.app(environ, start_response)
File '/usr/local/lib/python2.7/site-packages/pylons/wsgiapp.py', line 103 in __call__
  response = self.dispatch(controller, environ, start_response)
File '/usr/local/lib/python2.7/site-packages/pylons/wsgiapp.py', line 313 in dispatch
  return controller(environ, start_response)
File '/usr/local/lib/python2.7/site-packages/kallithea/lib/base.py', line 439 in __call__
  session.get('authuser'),
File '/usr/local/lib/python2.7/site-packages/paste/registry.py', line 137 in __getattr__
  return getattr(self._current_obj(), attr)
File '/usr/local/lib/python2.7/site-packages/beaker/session.py', line 659 in __getattr__
  return getattr(self._session(), attr)
File '/usr/local/lib/python2.7/site-packages/beaker/session.py', line 655 in _session
  **params)
File '/usr/local/lib/python2.7/site-packages/beaker/session.py', line 169 in __init__
  self.invalidate()
File '/usr/local/lib/python2.7/site-packages/beaker/session.py', line 317 in invalidate
  self.load()
File '/usr/local/lib/python2.7/site-packages/beaker/session.py', line 329 in load
  self.namespace.acquire_read_lock()
File '/usr/local/lib/python2.7/site-packages/beaker/container.py', line 211 in acquire_read_lock
  self.access_lock.acquire_read_lock()
File '/usr/local/lib/python2.7/site-packages/beaker/synchronization.py', line 154 in acquire_read_lock
  x = self.do_acquire_read_lock(wait)
File '/usr/local/lib/python2.7/site-packages/beaker/synchronization.py', line 251 in do_acquire_read_lock
  fcntl.flock(filedescriptor, fcntl.LOCK_SH)
IOError: [Errno 45] Operation not supported
```