add option to detache the VM from CLI

bin/vm

@@ -22,6 +22,10 @@ OptionParser.new do |opt|
   opt.on('--name NAME', 'Virtaul Machine name') do |name| 
     options.name = name
   end
+
+  opt.on('--detached') do 
+    options.detached = true
+  end
   # --port (ssh port)
   # --attached (do not leave the shell process)
   # new from copy