New Port: lua-resty-redis - for accessing redis from nginx lua

This Lua library is a Redis client driver for the ngx_lua nginx module:

http://wiki.nginx.org/HttpLuaModule

This Lua library takes advantage of ngx_lua's cosocket API, which ensures 100%
nonblocking behavior.

WWW: https://github.com/openresty/lua-resty-redis

PR: 191531
Submitted by: arcade@b1t.name (maintainer)
Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D13121