LU-13344 servers: change request timeouts to s32

LU-13344 servers: change request timeouts to s32

In the latest kernels time_t has been removed since time_t has
been a 64 bit value just like time64_t so no need for it anymore.
The field sf_run_time is stored on local media and its expected
to be 32 bit in size so change it to s32 explictly. The fields
the MDT coordinator that are currently time_t are a simple change
to s32 since they represent a time period and not a time stamp.
Lastly just update a comment in llog_swab.c since time_t will no
longer exist but we want to point out time in the llog is 32 bits
in size.

Change-Id: I0849fc9798c191d1fed77f7bba1357a209924418
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/37950
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>