modules/app_lua: add app_lua.list and app_lua.reload rpc commands
modules/app_lua: Added reload parameter to deactivate the reload check
modules/app_lua: Fix not C standard initialization
app_lua: moved local array for reload as global variable

- avoid runtime allocation/free for each execution when reload is
  enabled
- renamed sr_reload to _app_lua_sr_reload for better namespacing
  conflict resolution