add cj-btc-rocksdb: RocksDB module for blockchain database

[yuvicc]

New module providing a reader and writer over a RocksDB store of Bitcoin blockchain index data.

• BlockchainDatabase / WritableBlockchainDatabase interfaces and a shared AbstractRocksDbBlockchainDatabase base holding the read implementation
• BlockchainSchema for the key encodings and column family layout
• Integration and schema unit tests

[msgilligan]

I took a quick look -- and it looks like a great start!

[yuvicc]

Hmm, looks like a pending state would lose the data permanently, need to fix that before marking it for review.

[yuvicc]

I saw there's an integration testing script(test-run-regtest.sh) which runs bitcoind in regtest mode and tests the json-rpc, I have also added some integration tests here but adding this module to that script would be better?

[msgilligan]

I have also added some integration tests here

Do they use regTest?

but adding this module to that script would be better?

All you have to do is add a regTest target in your module and put tests in it and they will be run by that script.

[yuvicc]

All you have to do is add a regTest target in your module and put tests in it and they will be run by that script.

Alright!