autotest/virt-test — pull request #309 by QiuMike (2013-04-22 09:43:26+00:00)
Title: Fix image dir error of the test qemu.enospc 

Currently, the image_name has changed, the old fashion is like:
/tmp/kvm_autotest_root/images/f18-64, but the new is images/f18-64.
In test, need to use data_dir to get the images dir.