LU-56 libcfs: NUMA allocator and code cleanup

LU-56 libcfs: NUMA allocator and code cleanup

This patch covered a few things:
- Implementation of NUMA allocaters based on concept of CPU
  partition
- Add macros of NUMA allocators for both libcfs and OBD
- cleanup OBD allocaters
- A minor fix for llite, it's using GFP flag which should be
  CFS_ALLOC flag

Signed-off-by: Liang Zhen <liang@whamcloud.com>
Change-Id: I5441a504d5df217b59b5db59e37ddb4855e7ae49
Reviewed-on: http://review.whamcloud.com/2523
Tested-by: Hudson
Reviewed-by: Doug Oucharek <doug@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>