Comment 3 for bug 1188005

Please, when fixing this bug, take care of testing your fix with user-interact jobs as well, to avoid regressing here. Before this was added, on user-interact jobs, checkbox-cli didn't wait on the user to perform the action (i.e. it said "You have 20 seconds to enter a USB key", without allowing you to type "Enter" before those 20 seconds start to run)