monkey_driver: Make window-close take timeout=5

In the parallel test we run, it can sometimes take more than
a second for the JS compartment of a window to close down.  Since
that's part of the shutdown of a window, the driver can end up
timing out.  Default the timeout to 5s for window-close but make
it possible to specify in the yaml too.

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

test/monkey_driver.py

@@ -265,8 +265,9 @@ def run_test_step_action_window_close(ctx, step):
     tag = step['window']
     assert ctx['windows'].get(tag) is not None
     win = ctx['windows'].pop(tag)
+    timeout = int(step.get('timeout', 5))
     win.kill()
-    win.wait_until_dead()
+    win.wait_until_dead(timeout=timeout)
     assert not win.alive