qemu_migration: Move waiting for SPICE migration
Currently, we wait for SPICE to migrate in the very same loop where we wait for qemu to migrate. This has a disadvantage of slowing seamless migration down. One one hand, we should not kill the domain until all SPICE data has been migrated. On the other hand, there is no need to wait in the very same loop and hence slowing down 'cont' on the destination. For instance, if users are watching a movie, they can experience the movie to be stopped for a couple of seconds, as processors are not running nor on src nor on dst as libvirt waits for SPICE to migrate. We should move the waiting phase to migration CONFIRM phase.
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