[MERGE][#213425] Fix incompatibility with recent Paramiko versions

[Andrew Bennetts]

This fixes the "AttributeError: 'SSHSubprocess' object has no attribute
'get_name'" that some users have reported with current Paramiko.  A similar
problem this fixes is that paramiko expects channel.recv to return an empty
string when the connection has finished, rather than raising a socket.error.  

It also slightly improves the test coverage, by making the test code and the
real SFTP code share a little more code.  There's still some gaps in the test
coverage for this sort of problem, but this is a little better than what we had
before.

Without this fix, not only do we have bug 213425, the test suite will hang.

We definitely want this in 1.4.

-Andrew.

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