cleanup boltdb files failing to open during loading tables which are possibly corrupt #3605
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What this PR does / why we need it:
Sometimes files get corrupted when the process gets killed in the middle of a download operation which causes boltdb client to panic. We already recover the panic but the lock on the file is not released by boltdb client which causes the reopening of the file to fail when the sync operation tries it. We want to remove the file failing to open to get rid of the lock.