Merge the Isilon ATF code

This is a placeholder merge request to go over all of the items to ensure that I understand everything, some of the items from Isilon can be dropped as I dropped them from the atf branch (diff reduction), and make sure that any valid fixes from NetBSD can be pushed back.
Oh, I forget :) I think that seeing it fail once is enough to flag a problem. I seem to recall that's my motivation.
Any way is good, though.