vbox: handle 'saved' state of VMs
vbox: handle 'saved' state of VMs

VirtualBox has 'saved' state for VMs saved by the hypervisor.
However, the state is treated as VIR_DOMAIN_NOSTATE by the vbox
driver, resulting that virsh shows 'no state' for saved VMs.

The fix treats the state as VIR_DOMAIN_SHUTOFF as same as
other domains such as qemu.

Signed-off-by: Ryota Ozaki <d18bd3af6589332ccdaa02f8dcaa552d52fbdad6@gmail.com>

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