Propagate RPC through network service.

- Basic network message handler threading
- Correct references

beacon_node/network/src/messages.rs

@@ -1,27 +1,16 @@
 use libp2p::PeerId;
+use libp2p::{HelloMessage, RpcEvent};
 use types::{Hash256, Slot};
 
 /// Messages between nodes across the network.
 #[derive(Debug, Clone)]
 pub enum NodeMessage {
-    Status(Status),
+    RPC(RpcEvent),
     BlockRequest,
     // TODO: only for testing - remove
     Message(String),
 }
 
-#[derive(Debug, Clone)]
-pub struct Status {
-    /// Current node version.
-    version: u8,
-    /// Genesis Hash.
-    genesis_hash: Hash256,
-    /// Best known slot number.
-    best_slot: Slot,
-    /// Best known slot hash.
-    best_slot_hash: Hash256,
-}
-
 /// Types of messages that the network service can receive.
 #[derive(Debug, Clone)]
 pub enum NetworkMessage {