Check Lua source code with luacheck #178
Description
Checking test-run/lib/tarantool-python/test-run/lib/tarantool-python/tests/suites/box.lua 1 warning
test-run/lib/tarantool-python/test-run/lib/tarantool-python/tests/suites/box.lua:2:1: (W121) setting read-only global variable os
Tarantool issue: tarantool/tarantool#4681