depot_autopilot.run: relax reboot timeout

It might happen, in CPU intensive tests (like TCP bulk lxip), or when
printing debugging output after a failed test (as done currently on
staging), that the run script on the host gives up and reboots the
platform too early. Thus, we raise the buffer time. A reboot should
be necessary only in rare cases anyway.

Fixes #3387

repos/gems/run/depot_autopilot.run

@@ -873,9 +873,9 @@ while {1} {
 			init_previous_results
 		}
 		# determine timeout for the next timeout
-		set min_timeout 10
+		set min_timeout 20
 		regexp {depot_autopilot\] --- Run "(.*?)" \(max ([0-9]*?) } $output] ignore last_test_pkg min_timeout
-		set timeout [expr $min_timeout + 10]
+		set timeout [expr $min_timeout + 20]
 
 		set output ""
 	}