Show help message and exit.

Path to a config directory to pull *.conf files from. This file set is sorted, so as to provide a predictable parse order if individual options are overridden. The set is parsed after the file(s) specified via previous --config-file, arguments hence overridden options in the directory take precedence.

This option must be set from the command-line.

Path to a config file to use. Multiple config files can be specified, with values in later files taking precedence. Defaults to None. This option must be set from the command-line.