LU-9019 sec: migrate to 64 bit time

LU-9019 sec: migrate to 64 bit time

Replace cfs_time_current_sec() to avoid the overflow
issues in 2038 with ktime_get_real_seconds(). Mirgate
the rest of the gss code to time64_t to avoid the 2038
overflow issue.

Currently in encrypt_page_pools we are reporting the jiffy
cycles for "max wait time" which not only doesn't make
sense but can vary from platform to platform. Instead we
will report in terms of milliseconds. That requires changing
epp_st_max_wait into ktime_t since we need better than
seconds precision. Lastly the time in encrypt_page_pools for
"last access" and "last shrink" was showing up negative.
This was due to epp_last_* field being set to the number of
seconds since the epoch instead of the number of seconds
since the node booted. Change epp_last_* to being set by
ktime_get_seconds() instead of ktime_get_real_seconds()
resolves this problem.

Test-Parameters: trivial

Change-Id: Ia2d559454287675699a067121760543a2e6877da
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/29859
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>