Help output inconsistency: -v vs. -V

[Andrei Borzenkov]

We currently have situation that C converted tools use -V for
--version and -v for --verbose while shell based tools (quite a lot
left) use -v for --version and most do not have --verbose at all.

-V is quite deep in argp, but of course it is possible to get rid of it
by basically replicating argp code in grub (OK, we do not need check
for any hooks as we know there are none). 

It's not really new, and had been this way for some time, just that in
the past C programs were considered "for internal use only" and now
they are user facing so it is incompatible change.

Just gathering opinions what would be preferable.