Avoid using console.log in Satan.launchDaemon[child.once('message')] function

It breaks pm2 jlist if daemon is not started. In short if we use `pm2 jlist` when daemon is not started, the output is like the following:

```
{ online: true, success: true, pid: 9067, pm2_version: '0.9.6' }
[]
```

that is not a valid JSON - `jlist` command is therefore unusable programmatically.