LU-9019 lnet: move ping and delay injection to time64_t

Migrate away from jiffies for the pinger to time_64_t to one make
it clear its for time keeping and secondly to ensure the behavior
is consistent across any platform. Besides the lnet pinger code
move the lnet dely injection code to time64_t as well.

Change-Id: If363523893fc1dcce4eaa866501946edd6558751
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/30658
Tested-by: Jenkins
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Doug Oucharek <dougso@me.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>