Loading configuration file earlier

If we want to load weston.ini really early, so early that flight recorder can depend on it, then it has to happen before anything starts using weston_log(), as all weston_log() should be available to the flight recorder. Obviously load_configuration() needs to switch to fprintf(sdterr, ... then. That would actually be good, because weston_config_parse() already uses fprintf and not weston_log(), so config parsing errors will never make into the proper log anyway.

A follow-up from !693 (comment 1091006) and !693 (comment 1081628)