Setting Client-IP-Address in rlm_preprocess

[John Morrissey]

Client-IP-Address is dynamically set by xlat_packet(). AFAICT, there's no
way to trigger this in rlm_perl, so Client-IP-Address is never available in
rlm_perl handlers.

This leads to some interesting unlang to set Client-IP-Address in the
request so rlm_perl can access it:

authorize {
    update request {
        Client-IP-Address := "%{Client-IP-Address}"
    }
}

rlm_preprocess sets NAS-IP-Address if it's not set. Alan, would you accept a
patch to add similar behavior for Client-IP-Address?

john
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