[MERGE] Fix infinite busy-loop caused by connection loss during read of response body in HPSS v1 and v2.

[Andrew Bennetts]

Hi,

This patch fixes a bug in the v1 and v2 HPSS client code that causes the client
to consume 100% CPU indefinitely if a connection is lost while reading a body,
rather than aborting with an appropriate error.

(This bug was revealed by https://bugs.launchpad.net/bzr/+bug/236380, but is only
a secondary symptom, rather than a root cause.  It could easily happen in other
circumstances though.)

Happily, the v3 code was already robust in this situation.  I've added explicit
tests for all three protocol versions.

-Andrew.

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