perf test: Add a signal handler to kill forked child processes

If the `perf test` process is killed the child tests continue running
and may run indefinitely. Propagate SIGINT (ctrl-C) and SIGTERM (kill)
signals to the running child processes so that they terminate when the
parent is killed.

Signed-off-by: Ian Rogers <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Howard Chu <[email protected]>
Cc: Weilin Wang <[email protected]>
Cc: James Clark <[email protected]>
Cc: Ilya Leoshkevich <[email protected]>
Cc: Thomas Richter <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Dapeng Mi <[email protected]>
Cc: Athira Jajeev <[email protected]>
Cc: Michael Petlan <[email protected]>
Cc: Veronika Molnarova <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

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