lua-mosquitto: Import package and update

Imported from:
https://github.com/flukso/flm02/tree/develop/openwrt/package/lua-mosquitto

Added: license details
Added: Latest upstream code
Removed: test code no longer installed.
mosquitto: bump to latest 1.4 branch
lua-mosquitto: patch to remove pcalls from user interface

Port of https://github.com/flukso/lua-mosquitto/pull/7