land b_gns onto HEAD. If you are working on CMD, you MUST UPDATE YOUR

KERNEL, or LUSTRE WILL NOT BUILD.

- full GNS kernel updates added to vanilla-2.4.24 series
- Oleg patched the API updates into the other kernel series, but none
  of the GNS functionality is present.  I don't know how well those
  other series have been tested.
- I tested normal functionality, but have not tested GNS yet.