LU-9019 mgs: migrate to 64 bit time

LU-9019 mgs: migrate to 64 bit time

Port the remaining time code from 32 bits to 64 bits.
Replace cfs_time_current_sec() to avoid the overflow
issues in 2038 with ktime_get_real_seconds(). Moved
lprocfs_ir_timeout_seq_show from printing 32 times
to 64 bit times. Do a direction compare instead of
using the  cfs_time_before() wrapper. Change the
following to time64_t:

fsdb_barrier_expected
fsdb_barrier_latest_create_time
mgs_start_time
ir_timeout

Change-Id: I10bfd3f1479ad2823e325bfc464b802b210c238f
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/27910
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>