Comment 16 for bug 1544818

Note for QA:
It's very difficult to find hardware with 4K disk, that's why we can verify the patch just by checking that after provisioning cloud-init drive has ext2 format (the last partition):

root@node-2:~# parted /dev/vda print list
Model: Virtio Block Device (virtblk)
Disk /dev/vda: 107GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number Start End Size File system Name Flags
 1 1049kB 26.2MB 25.2MB primary bios_grub
 2 26.2MB 236MB 210MB primary
 3 236MB 446MB 210MB ext2 primary
 4 446MB 26.3GB 25.8GB primary
 5 26.3GB 107GB 81.0GB primary
 6 107GB 107GB 21.0MB ext2 primary