add scitoken authentication to non-generation jobs

closes #312 (closed)

to address the issue I moved the authentication logic to the base Node class and then added it to the non-generation jobs. I took the additional transfer paths out of the result merge jobs as those really shouldn't need anything other than the result files as inputs, but I can add that fairly easily.

@elise.sanger can you check if this resolves your issue?

I ran a test job that can be seen here.