Set all options to their initial values.

def initialize_options(self):  # suppress(unused-function)
        """Set all options to their initial values."""
        self._file_lines_cache = dict()
        self.suppress_codes = list()
        self.exclusions = list()
        self.cache_directory = ""
        self.stamp_directory = ""
        self.disable_linters = list()
        self.show_lint_files = 0