engine: Do not ignore+detach shards with failed Open/Init ops #2464
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Previously, storage engine ignored configured shards if they failed to open/init (with at least one successful). This behavior is unclear: if engine is configured to work with N shards, then all N shards must work, otherwise, the whole engine is broken and needs to be reconfigured.
Immediately fail engine's
Open
/Init
methods on any shard failure. With this, it's redundant to open/init shard concurrently, so they are processed one-by-one now.In the future, possibly, optional config flag will be added to ignore problem shards, but default behavior will be kept strict.