[Storehouse] 013 - Add util to verify checkpoint file

[zhangchiqing]

• Add a util checkpoint-verify-hash to verify the hash value of each node in the checkpoint file.
• Compare to the previous implementation MTrie.AValidTrie() which also verify the hash value of each node, this util had the following advantages:

1. Much less memory usage. The previous implementation has to load the entire checkpoint into memory before starting verification work. But this util doesn't load the checkpoint, instead, it iterates over each node in DFS manner, since the checkpoint file is saved in DFS manner, it guarantees the iteration callback can be called with the node and their children. The memory usage is O(n), n as the max depth of the trie.
2. Concurrency. The previous implementation is single threaded. This util has --n-worker to process verify n subtrie concurrently.

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