print out all known keys for a host if we get a unknown host key,

see discussion at http://marc.theaimsgroup.com/?t=101069210100016&r=1&w=4

the ssharp mitm tool attacks users in a similar way, so i'd like to
pointed out again:
	A MITM attack is always possible if the ssh client prints:
	The authenticity of host 'bla' can't be established.
(protocol version 2 with pubkey authentication allows you to detect
MITM attacks)

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