qemu: Report tunnelled post-copy migration as unsupported
qemu: Report tunnelled post-copy migration as unsupported

Post-copy migration needs bi-directional communication between the
source and the destination QEMU processes, which is not supported by
tunnelled migration.

https://bugzilla.redhat.com/show_bug.cgi?id=1371358

Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

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