Use the common code we now have to run QEMU instead of running it
ourselves, avoiding reliance on the machine showing up at 192.168.7.2.
This also makes a copy of the image rather than using -snapshot so if we
need to inspect the image after a failure, we can.
Fixes [YOCTO #7928].
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
