lxd/instance/drivers/driver/qemu: Copy parent volume config to snapshot volume config in qemuCreate
lxd/instance/drivers/driver/qemu: Copy parent volume config to snapshot volume config in qemuCreate

Fixes #8301

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

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