Change Details

In order to filter nodes based on whether they follow chain params or not, the seeder needs to be able to handle th `HEADER` messages after sending a `GETHEADER` message. This diff only covers the seeder's ability to receive the new types of messages. Depends on D4436

In order to filter nodes based on whether they follow chain params or not, the seeder needs to be able to handle the `HEADER` messages after sending a `GETHEADER` message. This diff only covers the seeder's ability to receive and process the new type of message. Depends on D4436

In order to filter nodes based on whether they follow chain params or not, the seeder needs to be able to handle the `HEADER` messages after sending a `GETHEADER` message. This diff only covers the seeder's ability to receive and process the new types of messages. Depends on D4436