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When loading endpoint_state from system.peers, pass the loaded nodes dc/rack info from storage_service::join_token_ring to gossiper::add_saved_endpoint. Load the endpoint DC/RACK information to the endpoint_state, if available so they can propagate to bootstrapping nodes via gossip, even if those nodes are DOWN after a full cluster-restart. Note that this change makes the host_id presence mandatory following https://github.com/scylladb/scylladb/pull/16376. The reason to do so is that the other states: tokens, dc, and rack are useless with the host_id. This change is backward compatible since the HOST_ID application state was written to system.peers since inception in scylla and it would be missing only due to potential exception in older versions that failed to write it. In this case, manual intervention is needed and the correct HOST_ID needs to be manually updated in system.peers. Refs #15787 Signed-off-by: Benny Halevy <bhalevy@scylladb.com>