osconfig tests: add Ubuntu to head tests (#1572)
osconfig tests: add Ubuntu to head tests (#1572)


GoogleCloudPlatform/compute-image-import,GoogleCloudPlatform/compute-image-import,adjackura/compute-image-tools,zmarano/compute-image-tools,GoogleCloudPlatform/compute-daisy,GoogleCloudPlatform/compute-image-tools,zmarano/compute-image-tools,GoogleCloudPlatform/compute-image-tools,GoogleCloudPlatform/compute-daisy,GoogleCloudPlatform/compute-image-import,zmarano/compute-image-tools,adjackura/compute-image-tools,adjackura/compute-image-tools,GoogleCloudPlatform/compute-image-tools