05:57:35.640:  1238: FAIL: fork.c:80: Task 16275 didn't exit (errno = 10 (No child processes))

There is no info about the killing signal in logs, add it.

https://jira.sw.ru/browse/PSBM-87579Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>