lxd/instance/drivers/driver/qemu: Detect error status in Stop and forcefully kill qemu process if exists
lxd/instance/drivers/driver/qemu: Detect error status in Stop and forcefully kill qemu process if exists

If we kill the qemu process we also perform the equivalent onStop cleanup actions as if the VM had stopped normally so we don't leave devices and mounts around on the host.

Fixes #8958

Signed-off-by: Thomas Parrott <6b778ce645fb0e3dde76d79eccad490955b1ae74@canonical.com>

hallyn/lxd,lxc/lxd,hallyn/lxd,stgraber/lxd,lxc/lxd,lxc/lxd,hallyn/lxd,atxwebs/lxd,atxwebs/lxd,hallyn/lxd,stgraber/lxd,stgraber/lxd,hallyn/lxd,stgraber/lxd,atxwebs/lxd,atxwebs/lxd,lxc/lxd,stgraber/lxd,stgraber/lxd,lxc/lxd,hallyn/lxd,lxc/lxd,stgraber/lxd,lxc/lxd