utils: add uefi.py

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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