lua* improvements.

Fix some issues with luarocks looking for the wrong version and cleanup
the lua and lua51 formulae.

Closes #32354.
luarocks: update 2.2.0_1 bottle.

Closes #33067.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
nailgun 0.9.1 (zombie formula)

As per #21880 nailgun was removed because it was woefully outdated and had moved to a new packaging format.
This commit brings the nailgun formula back from the boneyard and updates it to 0.9.1.
nailgun 0.9.1 (fixed comment)

Needed a few more words.
nailgun 0.9.1 (use a thread)

@mikemcquaid's feedback
nailgun 0.9.1 (more feedback)

Improve ruby style, split up arguments, and switch to backtics for killing the server.
nailgun 0.9.1 (add prefix patch)
nailgun: add 0.9.1 bottle.