The name scheme for loop devices changed to make gparted happy.

  lopart/pdev0 represents whole device

  lopart/pdev0p1 represents first partition on disk image
  lopart/pdev0p2 the seconst etc.

Then running

  gparted lopart/pdev0

allows to manipulate partitions on the image.

Signed-off-by: Pavel Pisa <ppisa@pikron.com>