[MERGE][#314247] Quick attempt at adding some EINTR-proofing to smart protocol code.

[John Arbash Meinel]

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Andrew Bennetts wrote:
> I saw <https://bugs.launchpad.net/bugs/314247>, which includes some failures due
> to EINTR occuring during recv calls.  This patch just tries to compensate for
> that, and fixes osutils.sendall the same way.
> 
> The new osutils.until_no_eintr function in this patch is taken verbatim from
> Twisted's twisted.python.util.untilConcludes function.  Twisted is
> MIT-licensed, although the function is nearly trivial.
> 
> -Andrew.
> 
> 

I would guess that doing:

 if e.errno == errno.EINTR:

would fit more closely with the rest of bzr's code. I would guess
Twisted uses e.args[0] because of older versions of python. Though
perhaps it is something with different platform errors?

Otherwise this seems ok.

BB:tweak

John
=:->
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