Rebase to upstream snapshot.
- Fix PPC build error (#967862)
- Fix crash on net_bootp command (#960624)
- Reset colors on ppc when appropriate (#908519)
- Left align "Loading..." messages (#908492)
- Fix probing of SAS disks on PPC (#953954)
- Add support for UEFI OSes returned by os-prober
- Disable "video" mode on PPC for now (#973205)
- Make grub fit better into the boot sequence, visually (#966719)