fix with/without definitions, --with should not define %_without and vice versa
- reset retry counter on 404 answer for all python 2.7.x versions
- Abort when the server is not answering with 200 or 404 when downloading _pubkey files
- really use the internal rpm signature check
- fixed bnc#807621

Bug summary: "osc: when forwarding a request, previous request is
not superseded automatically"
- fixed grammar error
- explain the "osc maintainer" command a bit more extensive
- do_service: fixed typo in command description

Thanks to Richard Bos <rbos@opensuse.org> for spotting this.