LU-9019 ldlm: migrate the rest of the code to 64 bit time

LU-9019 ldlm: migrate the rest of the code to 64 bit time

Replace the last cfs_time_current_sec() to avoid the overflow
issues in 2038 with ktime_get_real_seconds(). Reduce the jiffies
usage to the bare minimum which is useage for mod_timer() and
schedule_timeout(). This makes the ldlm totally 64 bit time
compliant.

Change-Id: Iaee92c17d51fdfc55bd26e9e813e30a6ce794856
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/29295
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>