Enable native user/group provide generation for the sysusers feature
    
    Currently systemd has it's own conflicting user/group provide generation
    but we need the rpm one for the sysuser integration. This must not
    proceed before https://src.fedoraproject.org/rpms/systemd/pull-request/109
    is merged + built because this involves a file-level conflict.
    
    Note that this does NOT enable the sysuser integration in rpm, merely
    the provides generation, but doing so will allow people to begin testing
    the actual integration.