Fixed get_partition_node_name

[schaefi]

The function get_partition_node_name takes the disk device and the partition index as arguments to match against the respective device node for this partition index. The partition index is the position of the partition in the partition table according to their start offset. For the code to function properly it is required that the list of partitions provided by lsblk is ordered according to the start address of the partitions in the table. The way lsblk was called did not enforce this ordering. This commit enforces the order to be done against the start offset and fixes bsc#1245190

[schaefi]

Confirmation from my team member @jgleissner is needed prior merge. Thus the don't merge label is still set

[schaefi]

All right, got confirmation from my colleague

apoz@amunoz-test-20250625-1:~> df -BG /dev/nvme0n1p3 | sed 1D
/dev/nvme0n1p3       10G    3G        8G  27% /
apoz@amunoz-test-20250625-1:~>    lsblk -p -l -o NAME,TYPE /dev/nvme0n1 | grep -E "part|md$" | cut -f1 -d ' '
/dev/nvme0n1p2
/dev/nvme0n1p3
/dev/nvme0n1p1
apoz@amunoz-test-20250625-1:~>  lsblk -p -l -o NAME,TYPE,START -x START /dev/nvme0n1 | grep -E "part|md$" | cut -f1 -d ' '
/dev/nvme0n1p1
/dev/nvme0n1p2
/dev/nvme0n1p3

so the fix works