* force the removal of existing nodes
* send generated log message to STDOUT and to a logfile
* fix a typo (bringign --> bringing)
* add a note to the documentation where to find the log files
* add a note to the documentation about the running time
* print the status of all VMs at the end
Change-Id: I29e9b0cb482188345345527e09b248eb8b0b52d7