* Correctly rebuild hash rings, don't use default with custom sharding
* Correctly initialize hash ring map with custom sharding
Don't load the non key ring by default
* Validate shard key for resharding more aggressively
When using auto sharding, require no shard key. When using custom
sharding, require a shard key.
* Only pass sharding method into shard holder construction
* Remove now obsolete debug assertion, we use same source config
* Correctly reconstruct hash rings, also add shard IDs in auto mode
* Add test, do not break consensus on invalid resharding down operation
* Add tests for resharding down shard count precondition
* Minor test tweaks
* Improve debug assertion
Co-authored-by: Roman Titov <ffuugoo@users.noreply.github.com>
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Co-authored-by: Roman Titov <ffuugoo@users.noreply.github.com>
