Remove register_retire from rfpkg

[eclipseo]

Don't register again the retire command as it is already done
by pyrpkg. Starting Python 3.11, it creates an error.
See python/cpython#18605

Fix #24

[eclipseo]

The only difference was the wording:

            description='This command will remove all files from the repo, '
                        'leave a dead.package file for rpms or dead.module '
                        'file for modules, and push the changes.'

versus

            description='This command will remove all files from the repo, '
                        'leave a dead.package file, push the changes and '
                        'retire the package in pkgdb.'

Not sure it makes such a big difference.

I've searched for other methods, but there is no provision for removing a parser (proposed in 2015 but not pursued) or modifying an existing parser.

[sergiomb2]

and with python 3.10 (or previous) this works ?

[eclipseo]

I have not tested it, but there is no reason it wouldn't. Adding twice the same subparsers was not something that was supposed to be done. Python 3.11 made it into an error, but there is no other behaviour change wrt Python 3.10 ad earlier.

[sergiomb2]

ah ok