[bisq-network/roles] Seednode Operator (#15)

[mrosseel]

## Cycle 2&3 report

Both seednodes now running stabel.
Had some issues which were investigated and these were the results:
When both the bitcoin fullnode (btcd) and the seednode start, there is a period in which btcd is still verifying the blockchain, i.e. it's not ready. If the seednode process talking to btcd (I'll call it btc_caller) does any requests in this period, it receives the 'RPC_IN_WARMUP' error (see https://bitcoin.stackexchange.com/questions/46662/bitcoind-error-28). This results in the btc_caller crashing, while the seed node continues operating. This results in no BSQ blocks being seen by the seednode, but for the rest operating normally. One fix would be to ignore these errors in the seednode and not crash the btc_caller.

Very curious why other operators have not noticed this behavior. I have seen similar errors reported by @alexej996 , one way to check this is to see if there's something running on port 5120. Do this also when it's running correctly, so you can compare. If nothing is running on 5120, btcd can no longer notify the seednodes if there's a new block.

bisq-network/compensation#312

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