Remove delayed lookups (#4992)

* initial rip out

* fix unused imports

* delete tests and fix lint

* fix peers scoring for blobs

beacon_node/network/src/router.rs

@@ -21,8 +21,6 @@ use lighthouse_network::{
     MessageId, NetworkGlobals, PeerId, PeerRequestId, PubsubMessage, Request, Response,
 };
 use logging::TimeLatch;
-use lru::LruCache;
-use parking_lot::Mutex;
 use slog::{crit, debug, o, trace};
 use slog::{error, warn};
 use std::sync::Arc;
@@ -111,14 +109,10 @@ impl<T: BeaconChainTypes> Router<T> {
             reprocess_tx: beacon_processor_reprocess_tx,
             network_globals: network_globals.clone(),
             invalid_block_storage,
-            delayed_lookup_peers: Mutex::new(LruCache::new(
-                crate::network_beacon_processor::DELAYED_PEER_CACHE_SIZE,
-            )),
             executor: executor.clone(),
             log: log.clone(),
         };
         let network_beacon_processor = Arc::new(network_beacon_processor);
-        network_beacon_processor.spawn_delayed_lookup_service();
 
         // spawn the sync thread
         crate::sync::manager::spawn(