autotest/virt-test — pull request #651 by xiaoqing-wei (2013-07-19 03:03:35+00:00)
Title: rename qcow3 to qcow2_v3 and disable it on unsupported hosts

images created with qemu-img -f qcow2 -o compat=1.1 is still qcow2 formation, but Version 3

Signed-off-by: Xiaoqing Wei