Update Syncing logic (#1042)

* Prevent duplicate parent block lookups

* Updates logic for handling re-status'd peers

* Allow block lookup if the block is close to head

* Correct ordering of sync logs

* Remove comments in block processer, clean up sim

beacon_node/network/src/sync/mod.rs

@@ -4,6 +4,8 @@
 mod block_processor;
 pub mod manager;
 mod network_context;
+mod peer_sync_info;
 mod range_sync;
 
 pub use manager::SyncMessage;
+pub use peer_sync_info::PeerSyncInfo;