Description of problem:

Some customers want to network boot systems through specifying the URI (file to load) directly in the UEFI boot entry.
Currently "efibootmgr" doesn't support this because of missing implementation in "efivar" library.

See https://github.com/rhboot/efivar/pull/217 for proposal.

Version-Release number of selected component (if applicable):

efivar < efivar-39

How reproducible:

N/A

Additional info:

Please review the Upstream PR.
I'm not completely sure about the versioning here: I bumped it because of new "efidp_make_uri()" interface.
Function "efi_generate_ipv4_device_path()" changed prototype so I guess it also requires specifying the new version, but I don't know how to handle that in the DL map.