Restore exporting of kernel threads as 'fake' processes. Different from

Restore exporting of kernel threads as 'fake' processes. Different from
before is the fact that we don't take initproc as blueprint anymore, but
rather fake up or set according to the thread the things we care about
explicitly. This also makes use of the newly added fill_kinfo_proc_thread()
in libkvm for operation on dumps feasible.

Also some minor cleanups to related code.

In-collaboration-with:	Simon 'corecode' Schubert <corecode@fs.ei.tum.de>