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If a datanode goes down for whatever reason then DML activity to chunks residing on (or targeted to) that DN will start erroring out. We now handle this by marking the target chunk as "stale" for this DN by changing the metadata on the access node. This allows us to continue to do DML to replicas of the same chunk data on other DNs in the setup. This obviously will only work for chunks which have "replication_factor" > 1. Note that for chunks which do not have undergo any change will continue to carry the appropriate DN related metadata on the AN. This means that such "stale" chunks will become underreplicated and need to be re-balanced by using the copy_chunk functionality by a micro service or some such process. In passing also fix SELECT behaviour on distributed caggs. We only connect to available DNs for invalidations handling. Fixes timescale#4846
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