IdP authentication method selection

[Tom Zeller]

> If this is best answered by examining the code for the IdP I
> would be grateful for any hints as to which file and which
> lines to consider.

Looks like 492 : AuthenticationEngine.java, the <String, LoginHandler>
HashMap returns an entrySet iterator, whose order is
non-deterministic, but really not random, meaning no attempt was made
to ensure randomness, afaict.

I think the wiki might be a little misleading by using the word "random".