[Bug 1980] use updated ssh-copy-id

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=1980

--- Comment #16 from Philip Hands <phil at hands.com> ---
OK, Martin's stuff partly incorporated, partly re-implemented.

Also, I've added a check for multiple -i options (which won't work, so
might as well throw an error) and added a message to distinguish
between the testing stage, and the key installation phase.

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