uefisign seems to have come first, but the efi* naming has won out in
our UEFI tooling and consistency is good. This fixes it so that
"efi<tab>" gives a reasonable view of what efitools we have in base.
uefi* links are added for compatibility, at least for now. Maybe it's
a reasonable idea to add such links for all of the efi tools, but I'm
punting on that for a moment.
Relnotes: maybe