Guard against interruption during invalid cloud config.

box.py

@@ -578,6 +578,7 @@ def vmcreate(args):
 
     # than, let's try to see if boostraping process has finished
     print('Waiting for cloud init to finish ', end='')
+    try:
         while True:
             if vbox.vm_info['uuid'] in vbox.get_running_vms():
                 print('.', end='')
@@ -586,6 +587,11 @@ def vmcreate(args):
             else:
                 print(' done.')
                 break
+    except KeyboardInterrupt:
+        print('\nIterrupted, cleaning up.')
+        VBoxManage(args.name).destroy()
+        return 1
+
     # dettach ISO image
     vbox.storageattach('IDE', 1, 'dvddrive', 'none')
     vbox.closemedium('dvd', path_to_iso)