Upgrade from V2 to V3 - how to change to SHA1

[Cantor, Scott]

> I worked out what I believe is the necessary Spring wiring, although it's
> difficult for me to test at the moment as I don't have an IdP with a legacy
> relying-party.xml config handy.  I did test that it's well-formed and doesn't
> blow up the IdP.

FWIW, you can test that kind of thing with the Eclipse testbed, I can walk you through it some time if you haven't used it.

-- Scott