Peter Xu 01f6e14c78 migration: add comment for TYPE_MIGRATE
It'll be strange that the migration object inherits TYPE_DEVICE. Add
some explanations to it.

Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <1498634144-26508-1-git-send-email-peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
2017-06-28 11:18:39 +02:00
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