retire_packagers: there is no self here
    
        Traceback (most recent call last):
          File "retire_packagers.py", line 386, in <module>
            sys.exit(main(sys.argv[1:]))
          File "retire_packagers.py", line 365, in main
            orphan_package(namespace, name, username)
          File "retire_packagers.py", line 192, in orphan_package
            req = self.requests_session.post(url, data=data, headers=headers)
        NameError: name 'self' is not defined
    
    Signed-off-by: Miro Hrončok <miro@hroncok.cz>