Fixed linter issues in `daemon/lua`, added more config tests
Files
7- Marek Vavruša authored
Also fixed improper promotion of `ffi` to global variable. ``` $ luacheck --codes daemon/lua/ Checking daemon/lua/config.lua OK Checking daemon/lua/kres-gen.lua OK Checking daemon/lua/kres.lua OK Checking daemon/lua/sandbox.lua OK Checking daemon/lua/trust_anchors.lua OK Checking daemon/lua/zonefile.lua OK Total: 0 warnings / 0 errors in 6 files ```
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