[PATCH] accepting changed hostkeys

[Gerd v. Egidy]

Hi,

I often change the machines (and thus the hostkeys) that are on a IP (a 
service environment with a IP assinged for the machine to test).
So every time I want to connect to a new machine I have to delete the previous 
key from the known_hosts file.

Since I got tired of running a remove script manually, I made this small patch 
which adds the possibility to replace the real key with the string 
"AcceptAllKeys" (case sensitive) in the known_hosts file.

e.g.:
replace
test,172.16.1.123 ssh-rsa AAAAB3Nz...
with
test,172.16.1.123 AcceptAllKeys
and it won't bug you anymore.

Any comments? I'm not 100% sure about the if (key == NULL) continue; part in 
my patch since I haven't digged through all the sources and checked where 
this lookup is used and how.

Would this patch be acceptible for the current development branch?

Kind regards,

Gerd

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