Travis should run Linux guest environment tests.
Travis should run Linux guest environment tests.

zmarano/compute-image-packages,rjschwei/compute-image-packages,GoogleCloudPlatform/compute-image-packages,wrigri/compute-image-packages,Sarsate/compute-image-packages,illfelder/compute-image-packages,Sarsate/compute-image-packages,zmarano/compute-image-packages,wrigri/compute-image-packages,rjschwei/compute-image-packages,wrigri/compute-image-packages,illfelder/compute-image-packages,wrigri/compute-image-packages