Bastian Köcher b35deaed95 Approve block announcements of backed blocks (#394)
* Approve block announcements of backed blocks

If we receive a block announcement without a statement attached that
matches the latest backed block, it is valid and we need to approve the
block announcement to download the block.

* Fix tests

* Approve block announcement if it comes from the best known block

* Fetch backed block only when required
2021-04-12 13:54:07 +02:00
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