[PATCH v5 0/3] search: new --efidisk-only option on EFI systems

[Renaud Métrich]

When using 'search' on EFI systems, we sometimes want to exclude devices
that are not EFI disks (e.g. md, lvm).
This is typically used when wanting to chainload when having a software
raid (md) for EFI partition:
with no option, 'search --file /EFI/redhat/shimx64.efi' sets root envvar
to 'md/boot_efi' which cannot be used for chainloading since there is no
effective EFI device behind.

This set of patches also refactor handling of --no-floppy option.

Changes in this version compared to reviewed one (PATCH v3, by Daniel):

- split --no-floppy refactoring (patch 2/3)
- fixed unitialized declaration of stack variable 'flags' (patch 2/3)
- documented --efidisk-only option (patch 3/3)