Fix TrieTest for JSON dump and add logging to Trie

The trie for the stateDB only stores:
- **key:** address     ----> 20 bytes
- **value:** rlp_encode(accountState)

The actual data in the stateDB has:
- **key:** sha3(rlp_encode(node))   ----> 32 bytes
- **value:** rlp_encode(node)