qemu-iotests: add qcow2.py set-feature-bit command This new command sets feature bits in the image file header: qcow2.py set-feature-bit incompatible|compatible|autoclear <bit> The bit number must be in the range [0, 64). Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>