LU-4423 ptlrpc: use 64-bit time for adaptive timeout

LU-4423 ptlrpc: use 64-bit time for adaptive timeout

The adaptive timeout handling stores absolute times in 32-bit time_t
quantities, which will overflow in 2038.

This changes it to use time64_t.

Linux-commit: 0ac0478b65de1e5b8b62f608bdf1d8ba631acc4d

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Change-Id: I50d1090865af8970276d039281fc2ca0b87fa8af
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/23270
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>