LU-9019 ptlrpc: migrate pinger to 64 bit time

LU-9019 ptlrpc: migrate pinger to 64 bit time

Replace cfs_time_current_sec() to avoid the overflow
issues in 2038 with ktime_get_real_seconds(). Remove
cfs_timeout_cap() and CFS_DURATION abstraction. Change
imp_next_ping, obd_eviction_timer, and ti_timeout to
time64_t. With these changes the pinger will be 64
bit time compliant.

Change-Id: I447dfa5d47ce947a5afa7203326b6486b8855912
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/28035
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>