ScriptDataConnector (idP3): Acquire a bean reference

[Rod Widdowson]

> Do we have provide any access to the resolver's Spring context in the
scripts?
> That might be useful.

It is tempting but I'd be nervous about polluting the scripts with Spring
dependencies, something we have avoided so far (in theory much of the IdP
could be build unsing another IOC technology) 

But there will be ways...

https://issues.shibboleth.net/jira/browse/IDP-809