[Pharo-project] Cleanup of the Zerconf scripts

With the release of 2.0 imminent we are going to cleanup the zeroconf scripts a bit: - the only valid VM scripts are PharoVM, StackVM and RizelVM - NBCogVM and CogVM scripts are going to be removed! so if you used ciPharo20NBCogVM.sh, use ciPharo20PharoVM.sh from now on! I will deprecate the scripts in a first step, and fully remove them within next week. I hope this won't cause too many problems, otherwise let me know.