[MERGE] Make 'bzr upgrade' work over HPSS.

[Andrew Bennetts]

This is a quick patch to make 'bzr upgrade' work over HPSS.  It does the bare
minimum necessary to let it work over VFS operations.  So it'll probably be
roughly as slow as doing an upgrade over e.g. SFTP.

I haven't tested it thoroughly yet, but it's pretty simple.

-Andrew.

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