gce: Set correct boot disk type for C4 and C4A machine series #133

Job	Run time
Build kdevops Container (opensuse)	2m 9s
Build kdevops Container (fedora)	1m 37s
Build kdevops Container (debian)	1m 55s
Linux A/B Tests (opensuse)	51s
Linux A/B Tests (debian)	1m 2s
Linux A/B Tests (fedora)	1m 12s
Quick Config Tests (blktests_nvme) on debian	54s
Quick Config Tests (blktests_nvme) on opensuse	50s
Quick Config Tests (xfs_reflink_4k) on fedora	49s
Quick Config Tests (xfs_reflink_4k) on debian	55s
Quick Config Tests (linux-ab-testing) on fedora	44s
Quick Config Tests (blktests_nvme) on fedora	48s
Quick Config Tests (lbs-xfs) on debian	52s
Quick Config Tests (lbs-xfs) on fedora	54s
Quick Config Tests (linux-ab-testing) on opensuse	51s
Quick Config Tests (xfs_reflink_4k) on opensuse	50s
Quick Config Tests (lbs-xfs) on opensuse	45s
Quick Config Tests (linux-ab-testing) on debian	49s
	18m 47s

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