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Resolves NIT-3047
Once in a while it takes more than 5 seconds to produce a block.
It was observed that, in several instances, "Persisted trie from memory database" which is related to HashScheme commit operation, co-occur with taking a long time to produce a block, which could indicate a causal relationship.
As an attempt to avoid that issue this PR makes Maintenance to also flush triedb to disk.
Depends on OffchainLabs/go-ethereum#398