A note about logging configuration

[Tom Zeller]

> On Jun 23, 2014, at 8:55 PM, "Cantor, Scott" <cantor.2 at osu.edu> wrote:
> 
>> On 6/23/14, 9:52 PM, "Tom Zeller" <tzeller at dragonacea.biz> wrote:
>> 
>> Yeah, I thought that too, I didn't really like what I committed. I'll
>> take a look again tomorrow.
> 
> I think Brent had the right idea, just inject a property list that is
> itself being populated from our properties via Spring, so we can adjust
> what we inject any time. Then any nesting is handled up front by Spring
> and logback just gets the resolved properties.

That was actually my first thought, but I was unsure of the syntax. So I injected the app ctx, but they don't provide Properties.stringPropertyNames(), and idp.home existed outside of the  resource, so I had to zig and zag, which we can cutout.