flua: add fbsd module

This module is bundled into flua, it only provides for now the exec
function. The point of the function is to be able to execute a program
without actually executing a shell.

flua: add fbsd module

This module is bundled into flua, it only provides for now the exec
function. The point of the function is to be able to execute a program
without actually executing a shell.

to use it:
fbsd.exec({"id", "bapt"})

Reviewed by: manu
Differential Revision: https://reviews.freebsd.org/D41840

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