Logging relyingPartyId (service provider) for authentication failures

[Cantor, Scott]

> Thanks Scott.  Is there a list of other MDC Variables?  Or is it just what is listed
> here:
  
That's it, they have to be set by something and the only code doing that now is a servlet filter sitting up at the top. It's perfectly possible to add something as a deployer to go plowing into the internals of the system and pull stuff out, but we could facilitate that.

-- Scott