autotest/autotest — pull request #370 by ypu (2012-05-31 07:20:47+00:00)
Title: virt: Add virt image module

Put all image related functions into one module and put the image
related function such as create and romve into one class.
This exports:
- two functions for get image/blkdebug filename
- one class for image operates
- options:
- image file name and format
- base image file name and format(option)
- snapshot image file name and format(option)
- functions:
- create
- remove
- clone_image
- rm_clone_image
- check_image
- backup_image
- convert(new)
- rebase(new)
- commit(new)
- snapshot_create(new)

Signed-off-by: Yiqiao Pu