* Accept GetNodeData requests
* Implement blockchain client method for node data requests
* Reuse old database read methods for node data
* fmt
* Copy & paste old tests...
* ... and make them work
* fmt
* Allow eth/66
* Add eth/66 request ids
* fmt
* Remove some leftovers
* fmt
* Change behaviour in case of missing peer info
- Assume eth/66 protocol, not earlier one
- Log just a trace, not an error