Derek Collison 9c02be2409 Various fixes for snapshots. ...

Due to bug, in rare circumstances could write an empty snapshot for aplied == 0. This would cause a spinning at the raft layer.

1. Allow Truncate() to also properly do a reset of the store when terms were only mismatch.
2. During testing fixed memstore truncate and also made sure per subject info was also cleaned up.
3. Then added fix to detect a bad snapshot on initialization and remove.
4. Do not allow snapshots for applied == 0.

Signed-off-by: Derek Collison <derek@nats.io>

2023-02-04 13:46:06 -08:00

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