LU-9019 osd: migrate osd-ldiskfs thandle stats to 64 bit time

LU-9019 osd: migrate osd-ldiskfs thandle stats to 64 bit time

To avoid the overflow in 2038 issues we migrate the
thandle stats from using jiffies to ktime.

Change-Id: I57260d55ca7c0921a9115f4717b13724b870826d
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/25161
Tested-by: Jenkins
Reviewed-by: Fan Yong <fan.yong@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>