LU-1144 ptlrpc: implement a NUMA aware ptlrpcd binding policy

LU-1144 ptlrpc: implement a NUMA aware ptlrpcd binding policy

This is a complement to the ORNL-22 general ptlrpcd threads pool
support.

This patch improves the PDB_POLICY_NEIGHBOR ptlrpcd binding policy,
when the kernel supports NUMA. In that case, the ptlrpcd threads are
all binded and have threads in the same NUMA node setup as partners.

Signed-off-by: Gregoire Pichon <gregoire.pichon@bull.net>
Change-Id: I8eb553d6f25fac6fd64faf1eecfa4dfae5ed15ee
Reviewed-on: http://review.whamcloud.com/2212
Tested-by: Hudson
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Fan Yong <yong.fan@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Liang Zhen <liang@whamcloud.com>