removal of kill?

[Pádraig Brady]

I see on most GNU/Linux distros that kill(1) is
provided by the shell or util-linux.
Should we just remove it from coreutils?

We might move 'kill' to the disabled_by_default_progs
list in build-aux/gen-lists-of-programs.sh,
but I'm thinking we should do like we did with su
and just remove it?

What prompted this was noticing that util-linux
and bash 4.4 have `kill -L` to produce a compact table,
and balking at the idea of keeping these options in sync.

cheers,
Pádraig.