Deleted read_config_files(), and moved it's functionality

	Deleted read_config_files(), and moved it's functionality
	to conffile.c: read_radius_conf_file(), radiusd.c: reread_config()

	Deleted configuration parser cruft from modules.c, as it's now
	done properly in conffile.c.

	The configuration file parser now pulls the relevant directories
	out of the configuration file, and uses those to read the rest
	of the configuration file entries.  The server-specific config
	is still handled in radiusd.c