new subcommand: monkeysphere export-subkey
Some users apparently have "a need to export their authentication-capable ssh subkey to machines that aren't currently supported by the monkeysphere":https://wiki.dtg.cl.cam.ac.uk/dtw30/public/monkeysphere-without-the-monkey-business .
Rather than encourage people to ad-hoc their way around this in ways that could be dangerous, maybe we should provide an "export-subkey" subcommand for monkeysphere that would produce a passphrase-encrypted ssh-style secret key file on stdout.
I worry that this will encourage people do do silly things like "not use an ssh-agent":https://www.debian-administration.org/users/dkg/weblog/64 , but i don't know how to avoid that without encouraging people to do even worse things.
(from redmine: created on 2013-02-14)