LU-9019 quota : migrate to 64 bit time

LU-9019 quota : migrate to 64 bit time

Replace cfs_time_current_sec() to avoid the overflow
issues in 2038 with ktime_get_real_seconds(). The
quota uses the libcfs 64 bit time abstraction it
developed before the linux kernel has created its
own. Replace all the libcfs 64 bit time handle with
generic time64_t handling.

Change-Id: Ibf9475c7ba8312561a57d48516ffa9b0b3ae4112
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/26452
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Niu Yawei <yawei.niu@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>