Allow deleting multiple images from shell

Adds nargs to image-delete to allow deleting
multiple images through cli.

Adds shell test for multiple image-delete.
Also makes a small correction in fakes to
correct image id of the second image to 2.

Fixes bug #1173511

Change-Id: I167a97cab75a6df544901e965d2cfa3c10a3958e
Merge "Allow deleting multiple images from shell"