The upload command has been slightly reworked, so it will create a default "upload manager" for itself. This was because each set of extensions had exactly the same 7 lines of code to create a boiler-plate manager. It had clearly been copy-pasted.

This work should
- remove calls to the command's "initialize()" method, which no longer has any effect
- remove the boiler-plate "_upload_manager()" functions in the extensions that create an upload manager, letting the base class do it for you

Example that should be removed: https://github.com/pulp/pulp_rpm/blob/4a2403a5d840f36fd78d5c9a2d482c813523227a/extensions_admin/pulp_rpm/extensions/admin/rpm_repo/pulp_cli.py#L115