Authdata, preauth plugin headers

[Greg Hudson]

On Mon, 2011-06-06 at 08:06 -0400, Linus Nordberg wrote:
> Do we need changes to the plugin API in order to enable for plugins to
> set and retrieve a/the PA-FX-COOKIE?

Possibly, yes, although I'd want to check with Sam on that.  At this
stage I'm trying to figure out whether changes like that would require
us to support the old version of the interface, or (because it's never
been a published interface) we can simply throw it out.