qemu_migration: Send disk sizes to the other side
Up 'til now, users need to precreate non-shared storage on migration
themselves. This is not very friendly requirement and we should do
something about it. In this patch, the migration cookie is extended,
so that <nbd/> section does not only contain NBD port, but info on
disks being migrated. This patch sends a list of pairs of:
<disk target; disk size>
to the destination. The actual storage allocation is left for next
commit.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
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