stand/lua: Remove a magic number/string (not a trivial literal)

We'll arbitrarily use KEYSTR_ for string representations of non-trivial
characters.

stand/lua: Say "loader prompt" instead of "lua interpreter"

Noting that we're in lualoader is nice, but it's not a difference we raelly
need to expose to Fred. Re-word it to match the 4th wording an

stand/lua: Say "loader prompt" instead of "lua interpreter"

Noting that we're in lualoader is nice, but it's not a difference we raelly
need to expose to Fred. Re-word it to match the 4th wording and reduce
differences.

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stand/lua: Remove explicit alias from "Back to main menu"

This removes a redundant alias that has since been converted into a global
alias. It was converted to a global alias before to ensure that w

stand/lua: Remove explicit alias from "Back to main menu"

This removes a redundant alias that has since been converted into a global
alias. It was converted to a global alias before to ensure that we always
have a way to go up one level in the menu.

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stand/lua: Move kernel selection into main menu

This matches the corresponding 4th behavior.

stand/lua: Don't descend into an empty kernels submenu

This submenu is likely going to go away in favor of kernel selection as it
is done in forth at the moment, but for the time being don't descend

stand/lua: Don't descend into an empty kernels submenu

This submenu is likely going to go away in favor of kernel selection as it
is done in forth at the moment, but for the time being don't descend into it
if we have no kernels available for listing.

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stand/lua: Reduce magic numbers

Enter/backspace values are hardcoded in both the menu and password scripts.
Separate these out to core for reuse between the two.

stand/lua: Always boot on 'enter' keypress in menus

stand/lua: Exit sub-menus on backspace

Add the lua scripts from the lua-bootloader SoC

These are the .lua files from from Pedro Souza's 2014 Summer of Code
project. Rui Paulo, Pedro Arthur and Wojciech A. Koszek also
contributed.

Obtain

Add the lua scripts from the lua-bootloader SoC

These are the .lua files from from Pedro Souza's 2014 Summer of Code
project. Rui Paulo, Pedro Arthur and Wojciech A. Koszek also
contributed.

Obtained from: https://wiki.freebsd.org/SummerOfCode2014/LuaLoader
Sponsored by: Google Summer of Code

Improve the SoC lua menu code to bring it in line with forth
menu functionality

Submitted by: Zakary Nafziger
Sponsored by: FreeBSD Foundation

Use loader.setenv and loader.unsetenv instead of loader.perform

Convert from include("/boot/foo.lua") to foo = require("foo");
to bring in line with latest lua module conventions.

Enforce a uniform style for the new .lua files:
o hard tab indenation for 8 spaces
o don't have if foo then bar; else bas; end on one line

MFC After: 1 month
Relnotes: yes
Differential Review: https://reviews.freebsd.org/D14295

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