[MERGE] Fix for running parallel tests on Mac OS X

[Robert Collins]

On Wed, 2009-06-03 at 21:03 -0500, John Arbash Meinel wrote:
> 
> Actually, IIRC in python 2.5+ KeyboardInterrupt is no longer caught by
> Exception. Still, I agree that (IOError, OSError), e: is probably
> better.

While we support python 2.4 though... :)

-Rob
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