change all build_cloud() (single/multi jvm/multi machine) to end with a single shutdown to h2o and no cloud probe after that and only one shutdown to node 0 in the cloud
so it ends like this now
2014-08-16 20:02:37.269515 -- Start http://192.168.0.34:54328/2/Exec2.json?str=z.hex=a=c(1,2,3); a[a[,1]>1,1]
2014-08-16 20:02:37.282249 -- Start http://192.168.0.34:54328/Shutdown.json