[offlineimap] Crash on OSX Yosemite python 2.7.6 (latency) (#205)

[Sébastien Gross]

As far as I can test the issue is in `imaplib2` line 2649:

```
self.sock.shutdown(socket.SHUT_RDWR)
```

The problem does not happen when only closing the writer side using `SHUT_WR`. This means for some reason the reader side has been shutdown. I cannot see why.

Is there a reason shutting down both sides since the `finally` block does a `close()`?

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https://github.com/OfflineIMAP/offlineimap/issues/205#issuecomment-153480214
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