Fix clippy warnings (#1385)

## Issue Addressed

NA

## Proposed Changes

Fixes most clippy warnings and ignores the rest of them, see issue #1388.

beacon_node/network/src/sync/manager.rs

@@ -315,7 +315,7 @@ impl<T: BeaconChainTypes> SyncManager<T> {
                 if let Some(block_request) = self.single_block_lookups.get_mut(&request_id) {
                     // update the state of the lookup indicating a block was received from the peer
                     block_request.block_returned = true;
-                    single_block_hash = Some(block_request.hash.clone());
+                    single_block_hash = Some(block_request.hash);
                 }
                 if let Some(block_hash) = single_block_hash {
                     self.single_block_lookup_response(peer_id, block, block_hash);
@@ -498,8 +498,7 @@ impl<T: BeaconChainTypes> SyncManager<T> {
         if self
             .single_block_lookups
             .values()
-            .find(|single_block_request| single_block_request.hash == block_hash)
-            .is_some()
+            .any(|single_block_request| single_block_request.hash == block_hash)
         {
             return;
         }
@@ -598,6 +597,7 @@ impl<T: BeaconChainTypes> SyncManager<T> {
     // These functions are called in the main poll function to transition the state of the sync
     // manager
 
+    #[allow(clippy::needless_return)]
     /// A new block has been received for a parent lookup query, process it.
     fn process_parent_request(&mut self, mut parent_request: ParentRequests<T::EthSpec>) {
         // verify the last added block is the parent of the last requested block

beacon_node/network/src/sync/peer_sync_info.rs

@@ -102,12 +102,7 @@ impl PeerSyncInfo {
     /// than SLOT_IMPORT_TOLERANCE of our current head.
     /// 2) The peer has a greater finalized slot/epoch than our own.
     fn is_advanced_peer(&self, remote: &PeerSyncInfo) -> bool {
-        if remote.head_slot.sub(self.head_slot).as_usize() > SLOT_IMPORT_TOLERANCE
+        remote.head_slot.sub(self.head_slot).as_usize() > SLOT_IMPORT_TOLERANCE
             || self.finalized_epoch < remote.finalized_epoch
-        {
-            true
-        } else {
-            false
-        }
     }
 }

beacon_node/network/src/sync/range_sync/chain.rs

@@ -104,6 +104,7 @@ pub enum ChainSyncingState {
 }
 
 impl<T: BeaconChainTypes> SyncingChain<T> {
+    #[allow(clippy::too_many_arguments)]
     pub fn new(
         id: u64,
         start_epoch: Epoch,
@@ -257,7 +258,7 @@ impl<T: BeaconChainTypes> SyncingChain<T> {
     /// Sends a batch to the batch processor.
     fn process_batch(&mut self, mut batch: Batch<T::EthSpec>) {
         let downloaded_blocks = std::mem::replace(&mut batch.downloaded_blocks, Vec::new());
-        let process_id = ProcessId::RangeBatchId(self.id.clone(), batch.id.clone());
+        let process_id = ProcessId::RangeBatchId(self.id, batch.id);
         self.current_processing_batch = Some(batch);
         spawn_block_processor(
             Arc::downgrade(&self.chain.clone()),