LU-6529 ldlm: cancel aged locks for LRUR

It doesn't make sense to keep the very aged lock even with the
LRUR policy. This patch decreased the default ns_max_age from 10
hours to 65 minutes and changed LRUR policy to cancel very aged
locks.

Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Change-Id: Iabf6f50a7837821afcf2a75b6c17c7484b34667f
Reviewed-on: http://review.whamcloud.com/14856
Tested-by: Jenkins
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>