Uninstall for new worker nodes added by node cmd

[krotz-dieter]

Describe the solution you'd like The issue #39 introduces the possibility to add and remove new nodes. Within this issue the uninstall cmd needs to be enhanced so that it supports these additional nodes. In case of an uninstall for the additional worker nodes only the system services like kubelet and container runtime shall be removed (everything what was added with node add), no shutdown of the new node shall happen. The system shutdown is the responsibility of the user maintaining the new node.