6addde2 qemu: Add pause-before-switchover migration capability

Authored and Committed by Jiri Denemark 6 years ago
    qemu: Add pause-before-switchover migration capability
    
    This new capability enables a pause before device state serialization so
    that we can finish all block jobs without racing with the end of the
    migration. The pause is indicated by "pre-switchover" state. Once we're
    done QEMU enters "device" migration state.
    
    This patch just defines the new capability and QEMU migration states and
    their mapping to our job states.
    
    Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
    
        
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