tests: fix i_qcow test to properly test e2image's qcow-to-raw functionality

The test script was not properly checking e2image's ability to convert
a qcow2 image back to a raw image.  Fix this, and also change it to
use /tmp for the temporary files to speed things up systems with a
ramdisk for /tmp.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2 files changed