The name or jid always gets added to the params, and that's enough to
avoid allocating a 0 length params array.
Reported by: kevans
Reviewed by: kevans
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D28778
libjail is pretty small, so it makes for a good proof of concept demonstrating
how a system library can be wrapped to create a loadable Lua module for flua.
* Introduce 3lua section for man pages
* Add libjail module
Reviewed by: kevans, manpages
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D26080