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

[Andrew Bennetts]

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.

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