Implement a unit test for `receipt_chain_hash`

[georgeee]

Implement a unit test that would:

1. Take binaries for two branches
2. Launch the network from the first branch, send some transactions and then do the ledger export
3. Launch the network from the second branch with the same genesis ledger, send the same transactions and do the ledger export
4. Check equality of exported ledgers (with BP accounts being withheld from comparison)