autotest machines: configuration changed
Since our tests start to be (sometimes) disk space demanding, I set gb_diskspace_required:
5 in ~autotest/global_config.ini on both autoqa production and staging. That should make
sure our tests don't crash because of insufficient disk space, the clients just get
locked.
In the future we need to solve how to automatically prune some directories (like mock
cache), since they just grow and grow. For the time being I'm fine with manually
erasing them from time to time.