conpaas: hide the autoscaling settings until autoscaling is ready.
added random sample selection; cleaned up some code
No need to create explicitly the loop for the device, it is done by 'mount -o loop'. This fixes the bug where grub-probe failed to detect the partition type msdos (expecting it on /dev/loop1 as device.map says but wrongly found on /dev/loop2).
Due to a change in pip (or xmltodict ??) need to install distribute