authn/SAML outbound entityId

[Scott Cantor]

Other than timing issues, an SPSSODescriptor role is eventually going to be there, but I doubt I would approach it that way.

A tag to drive an override would be the expected way to handle this. In principle either set being tagged would work, and it could be simpler to slap a tag on the one metadata source as potentially many.

Do not make the mistake of assuming "registered by InCommon" is what you want because most IdPs import all of eduGAIN, not just InCommon.

- Scott