Console switching not working on ev3dev-stretch

[dlech]

We had to disable the console switching in brickman on ev3dev-stretch because of #64. It was causing a lockup (probably due to a race condition between brickman and the openrobertalab service).

This means brickman will still be visible while openroberta programs are running.

Ideally, the openrobertalab service should handle the console switching instead of brickman. See https://github.com/ev3dev/console-runner/blob/ev3dev-stretch/src/server.vala for an example.