Attribute filter

[Tom Zeller]

> I was just hoping that there might be a way to short cut writing all the
> flows, not least b/c the flow I write may have steps which are not in the
> release flows, but also to cut down typing.

Not sure exactly what you need, but take a look at the override*()
methods in AbstractFlowTest. For example,
AbstractFlowTest.overrideIPBasedAuthn() grabs the FlowDefinition from
the FlowExecutor and overrides the XML flow definition via Java.