Remove references to ChallengeResponseAuthentication in favour of

KbdInteractiveAuthentication.  The former is what was in SSHv1, the
latter is what is in SSHv2 (RFC4256) and they were treated as somewhat
but not entirely equivalent.  We retain the old name as deprecated alias
so config files continue to work and a reference in the man page for
people looking for it.

Prompted by bz#3303 which pointed out the discrepancy between the two
when used with Match.  Man page help & ok jmc@, with & ok djm@

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