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Add UEFI related utilities inside a new utility module: uefi.py
_check_efibootmgr_json
======================
Check if the system efibootmgr executable supports JSON output. This is
a private function used only by other functions from uefi.py.
is_uefi_supported
=================
Check if the system supports UEFI firmware.
run_efibootmgr_json
===================
Runs efibootmgr with json output support. Return the JSON output as a
Python dict.
efibootmgr_create_bootentry
===========================
Create nvram boot entry. This bootentry is usually later set to boot
next just once via "BootNext" nvram variable.
efibootmgr_delete_bootentry
===========================
Delete a nvram boot entry. Used to avoid duplicates when booting the
same disk and partition from a given client.
efibootmgr_bootnext
===================
Set nvram "BootNext" variable to a given boot entry so after client
reboot, PXE is not executed and the given boot entry takes precedence.
Add dependency with efibootmgr version >= 18, and efibootmgr JSON output
which is currently out of tree from util-linux repo.
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