LU-9019 osc: migrate to 64 bit time

LU-9019 osc: migrate to 64 bit time

Change od_contention_time from int to time64_t to make it clear
this field is in units of seconds. Change the *_contention_time
fields from jiffies to ktime_t to make it clear we are dealing
with time and ktime_t is consistent on any platform unlike
jiffies.

Change-Id: Ieb240e40cc4d56050607314db057004db00aae13
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/30607
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>