add prototype for openafs-kernel 1.6.6
moved openafs-kernel to correct category
add openafs-kernel from bugs.gentoo.org

https://bugs.gentoo.org/show_bug.cgi?id=500378
add openafs and move files to correct place
create manifest files for openafs 1.6.6
try openafs modules from jtriley

Source: http://gpo.zugaina.org/Overlays/jtriley
I slightly modified them to better reflect the 1.6.6. The patches are
the same for 1.6.5 and 1.6.6 (see sha)