v2->v3 upgrade, google apps

[Klingenstein, Nate]

> Based on your suggestions and further experimentation, I set the format
> to something other than unspecified in the the attribute resolver and
> Google metadata

It's actually hardcoded to make the use of unspecified more difficult.  I suspect you hit that.

https://wiki.shibboleth.net/confluence/display/IDP30/CustomNameIDGenerationConfiguration#CustomNameIDGenerationConfiguration-Dealingwith"Unspecified"