a291832963
Add test coverage for bochs display device [1]. Bochs is considered a safe and simplified alternative to use over VGA when UEFI is enabled. Test creates an image with firmware type of UEFI and video model of bochs. Boots guest and confirms the model is present. [1] https://blueprints.launchpad.net/nova/+spec/add-bochs-display-device Change-Id: I85f6fdda6a1c1042de2870a9d9f13f4cc6b32974