This isn't quite the full thing. I think that Pino is also working on
replacing the ssh and scp commands in the v2v/input_vmx.ml file with
libssh. Without those changes, -i vmx will still issue raw ssh and
scp commands, which will use ssh-agent (or keyboard-interactive).
The Xen input method doesn't use raw ssh and scp commands, so that one
is OK.
Rich.