If we want to includes hash of the context in the block header, we
cannot have a (default) commit message that includes the block hash.
We break this circular dependency by removing the default commit
message.
- `lib_node_p2p_base`: Base datatypes for the P2P layers
- `lib_node_services`: RPC service definitions (depends on `node_p2p_base`)
- `lib_node_http`: RPC http server
- `lib_node_p2p`: the P2P workers
