init: verify option lat_percentiles consistency for all jobs in group

init: verify option lat_percentiles consistency for all jobs in group

lat_percentiles is used to control if the high/low latency statistics
(which are saved in ts->io_u_plat_high_prio/ts->io_u_plat_low_prio)
should collect and display total latencies instead of completion latencies.

When doing group reporting, stat.c:__show_run_stats() happily overwrites
the dst ts with the setting of each job, which means that the summing can
take total lat samples for some jobs, and clat samples for some jobs, while
adding samples into the same group result.

The output summary will claim that the results are of whatever type the
final job in the group is set to.

To make sure that this cannot happen, verify that the option
lat_percentiles is consistent for all jobs in group.

Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Link: https://lore.kernel.org/r/20220203192814.18552-2-Niklas.Cassel@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>