Comment 4 for bug 1079460

This may not be something that can be easily 'fixed', it may just be the way it is. So, a change to the unity autopilot tests to get back into the desired showdesktop state after running a test is here:
https://code.launchpad.net/~fginther/unity/autopilot-showdesktop-cleanup/+merge/134756

This isn't a 100% solution as a test can still get into a state where it cannot leave showdesktop active mode.