Modify the plainbox.conf for setting the snapd timeout.

Tools/PC/oem-qa-checkbox-installer/conf/plainbox.conf

@@ -20,10 +20,11 @@ TEST_TARGET_IPERF = 10.102.182.100,10.102.182.137,10.102.182.48,10.102.183.36,10
 STRESS_BOOT_ITERATIONS = 30
 STRESS_BOOT_WAKEUP_DELAY = 100
 STRESS_BOOT_WAIT_DELAY = 60
+SNAPD_TASK_TIMEOUT = 600
+# S3 and S2idle will using the same variables
 STRESS_S3_ITERATIONS = 30
 STRESS_SUSPEND_REBOOT_ITERATIONS = 3
 STRESS_S3_SLEEP_DELAY = 60
 STRESS_S3_WAIT_DELAY = 60
 STRESS_SUSPEND_SLEEP_THRESHOLD = 10
 STRESS_SUSPEND_RESUME_THRESHOLD = 5
-