Log Message:
Update security/py-ssh to 1.7.13.

Upstream changes:

## ssh 1.7.13 (2012-02-13)

* #5: Moved a `fcntl` import closer to where it's used to help avoid
  `ImportError` problems on Windows platforms. Thanks to Jason Coombs for the
  catch + suggested fix.
* #4: Updated implementation of WinPageant integration to work on 64-bit
  Windows. Thanks again to Jason Coombs for the patch.