Literal ip4/6 addresses in VCL

[Poul-Henning Kamp]

In message <4B93B0AB.4080107 at schokola.de>, Nils Goroll writes:

>My main question is if they should be tokenized as CSTRs or rather as new 
>tokens, e.g. of token type IP (not to be confused with variable type IP).

The syntax for this is already decided, just not implemented:

	set client.ip = IP(req.http.x-forwarded-for);

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