move RequestedAttribute to idp-attribute-api ?

[Rod Widdowson]

> >Is idp-attribute-api the appropriate location for RequestedAttribute ?
> >
> >It looks like it is referenced by classes in both idp-attribute-filter
> >and the new idp-attribute-mapper.
> 
> Either there or in the mapper module probably.
> 

I'd probably favour mapper-api, but only marginally: I suppose that in some
sort of improbably future there might be other types of mapped Attributes...

Rod