LUDOC-97 tuning: SMP node affinity parameters are now documented.

LUDOC-97 tuning: SMP node affinity parameters are now documented.

SMP Node Affinity arrived with Lustre 2.3 (LU-56). The default
values SMP machines are judged to be suitable for most workloads.
If and administrator does want to tinker, this change records
the available parameters.

Entries added to the glossary for NUMA and Node Affinity.

Signed-off-by: Richard Henwood <richard.henwood@intel.com>
Signed-off-by: Liang Zhen <liang.zhen@intel.com>
Change-Id: Ib5dd25431046d2842cbde77f0b6fede47a790da7
Reviewed-on: http://review.whamcloud.com/4413
Tested-by: Hudson
Reviewed-by: Doug Oucharek <doug.s.oucharek@intel.com>
Reviewed-by: Liang Zhen <liang@whamcloud.com>
Reviewed-by: Cliff White <cliff.white@intel.com>