Add check for device not found

https://github.com/appium/appium/issues/2995
Disregard my previous comment. It's outCheck that we want to delete.

deviceCheck should be looking for `error: device not found` on stderr based on [the logs](https://gist.github.com/bootstraponline/3f64b70f6e4c2b483142#file-device_not_found-L70), not the truncated `device not found`