IdP3 Force Authentication Context for select CAS services

[Cantor, Scott]

>                                 <bean parent="CAS.LoginConfiguration"
> p:defaultAuthenticationMethods="http://www.duosecurity.com/" />

People have indicated that using strings like that works, but to my understanding it really shouldn't, the property type there is a collection of AuthnContextClassRefPrincipal objects and certainly all our examples and documentation assume that. At minimum, it may be that it works in some cases and not others, so depending on it working on simple strings like that seems unwise.

-- Scott