k8sdemo: Issues after running cleanup_machines.sh

[pkeerthana]

If you try to setup k8s cluster after running cleanup_machines.sh, below issues are seen:
a) prepare.sh fails saying etcd cannot be uninstalled
b) Setup script fails saying netmaster, netplugin and aci-gw services cannot be started because service does not exist - systemd needs reload after copying the .service files which have been deleted by cleanup_machines.sh
b) docker service is stopped, and not restarted by the setup scripts on master node