overridding admin interface beans/flows

[Cantor, Scott]

> (*) Adding admin flows (or login flows, or interceptors) also requires
> creating a particular flow descriptor bean that auto-registers itself, that's
> a 4.1 change to make plugins easier. That part is fully supported and
> documented (poorly) in the developer side of the wiki.

This is under https://shibboleth.atlassian.net/wiki/spaces/IDP4/pages/1265631887/Administration

-- Scott