idp 3.0.0 catch 22

[Tom Zeller]

>> FWIW, it seems I can use jetty 8 for now.  Is there any
>> reason it won't work for some capability I haven't tested?
> 
> Nothing specific, but we didn't test it and I didn't document it. It was a sort of transition release that didn't last long. It is new enough to have servlet 3.0 support.

Not sure it matters, but we don't have a Jetty 8 trust-any backchannel plugin. I don't recall how those Jetty APIs changed between 7, 8, and 9.