Implement [JENKINS-23665] Parameter to select alias ...

Hope this will be helpful also for others.
If you want to do me a favor, promote it into the next LTS as well.

If I may ask: 
Is there a reason that Jenkins ... sorry ... Winstone is locked to the 8.x branch of Jetty?

Hi Daniel. I am not sure what exactly you are referring to.
Also is this just an expression of opinion or do you mean to say "won't pull because of this"?