Reduce login delay when MAC spoofing fails
39cc195e & #17779 (closed) introduced a delay when MAC spoofing fails. This patch reduce it by making tails-spoof-mac wait its subprocesses to exit only up to 15 seconds.
refs #17813
39cc195e & #17779 (closed) introduced a delay when MAC spoofing fails. This patch reduce it by making tails-spoof-mac wait its subprocesses to exit only up to 15 seconds.
refs #17813