autolvm breaks GPT partitioned turnkey installations

[techstoa]

If turnkey is installed on a disk that is larger than 2TB, the disk ends up partitioned with a GPT partition table.

On these systems, the autolvm installer ends up removing the BIOS Boot partition, which leaves turnkey unable to boot.

Before autolvm installation:

Command (m for help): p
Disk /dev/vda: 3.64 TiB, 4000000770048 bytes, 7812501504 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 150D2FAC-2528-46E9-B410-E651833414B9

Device     Start        End    Sectors  Size Type
/dev/vda1   2048       4095       2048    1M BIOS boot
/dev/vda2   4096 7812499455 7812495360  3.6T Linux LVM

After autolvm installation:

Command (m for help): p
Disk /dev/vda: 3.64 TiB, 4000000770048 bytes, 7812501504 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 150D2FAC-2528-46E9-B410-E651833414B9

Device     Start        End    Sectors  Size Type
/dev/vda2   4096 7812499455 7812495360  3.6T EFI System