[Legacy] CBM outputs a warning about the kernel is still using the old partition table.

[puneetse]

Describe the bug
CBM outputs a warning about the kernel is still using the old partition table for legacy boot (syslinux) systems.

Reported on the forums and in IRC with logs in (paste|term)bin links 1 2.

# clr-boot-manager update
Warning: The kernel is still using the old partition table.
The new table will be used at the next reboot or after you
run partprobe(8) or kpartx(8)
The operation has completed successfully.

To Reproduce
Steps to reproduce the behavior:
clr-boot-manager update or swupd update (which calls cbm)

Expected behavior
No warning, self-resolving if possible.

[dorileo]

this is the syslinux implementation calling sgdisk, it's harmless but I agreed it leads to confusion, I'll silent it. Thanks.