Fix exit code handling
Fix exit code handling

When we ask bootstrap.js to exit we pass the value as the `exit` member of the tasks structure. Problem is that bootstrap.js seems to expect it to be `exit.code`. I've fixed this defensively as I'm not sure if there are prior installations that expect the `exit.code` value.
RackHD/on-http,keedya/on-http,larry-dean/on-http,lanchongyizu/on-http,keedya/on-http,RackHD/on-http,larry-dean/on-http,lanchongyizu/on-http,lanchongyizu/on-http,larry-dean/on-http,keedya/on-http,larry-dean/on-http,lanchongyizu/on-http,RackHD/on-http,keedya/on-http,RackHD/on-http