upcoming s/key changes

[Markus Friedl]

could someone please review this change?

http://131.188.30.102/~msfriedl/openssh/SSHD_AUTH_PATCH 

is a diff against openbsd's cvs
and will commited ASAP.

the patch tries to unify various challenge/response
methods in ssh1 and ssh2.

faking s/key is dropped, since i am not
sure what do do for faking cryptocard and
other challenge/response methods.

-markus