Address Soren's comments:

 * clean up temp files if an ImageUnacceptable is going to be raised
   Note, a qemu-img execution error will not clean up the image, but I
   think thats reasonable.  We leave the image on disk so the user can
   easily investigate.
 * Change final 2 arguments to fetch_to_raw to not start with an _
 * use 'env' utility to change environment variables LC_ALL and LANG so
   that qemu-img output parsing is not locale dependent.
   Note, I considered the following, but found using 'env' more readable
     out, err = utils.execute('sh', '-c', 'export LC_ALL=C LANG=C && exec "$@"',
         'qemu-img', 'info', path)

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