Filter gossipsub message duplication (#736)

* Add duplication prevention to gossipsub

* Clean up topic logs

* Add content addressed messages for gossip

beacon_node/network/src/sync/mod.rs

@@ -1,14 +1,13 @@
 //! Syncing for lighthouse.
 //!
 //! Stores the various syncing methods for the beacon chain.
-mod manager;
-mod message_processor;
+pub mod manager;
 mod network_context;
 mod range_sync;
 
-pub use message_processor::MessageProcessor;
-
 /// Currently implemented sync methods.
 pub enum SyncMethod {
     SimpleSync,
 }
+
+pub use manager::SyncMessage;