Find all '.new' files from /etc/ folder
        and subfolders

def find_new(self):
        """Find all '.new' files from /etc/ folder
        and subfolders
        """
        print("\nSearch for .new configuration files:\n")
        for path, dirs, files in os.walk(self.etc):
            del dirs    # delete unsed
            for f in files:
                if f.endswith(".new"):
                    self.news.append(os.path.join(path, f))
        if not self.news:
            print("  No new configuration files\n")
            raise SystemExit()