Fix clippy warnings (#813)

* Clippy account manager

* Clippy account_manager

* Clippy beacon_node/beacon_chain

* Clippy beacon_node/client

* Clippy beacon_node/eth1

* Clippy beacon_node/eth2-libp2p

* Clippy beacon_node/genesis

* Clippy beacon_node/network

* Clippy beacon_node/rest_api

* Clippy beacon_node/src

* Clippy beacon_node/store

* Clippy eth2/lmd_ghost

* Clippy eth2/operation_pool

* Clippy eth2/state_processing

* Clippy eth2/types

* Clippy eth2/utils/bls

* Clippy eth2/utils/cahced_tree_hash

* Clippy eth2/utils/deposit_contract

* Clippy eth2/utils/eth2_interop_keypairs

* Clippy eth2/utils/eth2_testnet_config

* Clippy eth2/utils/lighthouse_metrics

* Clippy eth2/utils/ssz

* Clippy eth2/utils/ssz_types

* Clippy eth2/utils/tree_hash_derive

* Clippy lcli

* Clippy tests/beacon_chain_sim

* Clippy validator_client

* Cargo fmt

beacon_node/beacon_chain/src/builder.rs

@@ -448,7 +448,7 @@ where
         let fork_choice = if let Some(persisted_beacon_chain) = &self.persisted_beacon_chain {
             ForkChoice::from_ssz_container(
                 persisted_beacon_chain.fork_choice.clone(),
-                store.clone(),
+                store,
                 block_root_tree,
             )
             .map_err(|e| format!("Unable to decode fork choice from db: {:?}", e))?
@@ -462,7 +462,7 @@ where
                 .ok_or_else(|| "fork_choice_backend requires a genesis_block_root")?;
 
             let backend = ThreadSafeReducedTree::new(
-                store.clone(),
+                store,
                 block_root_tree,
                 &finalized_checkpoint.beacon_block,
                 finalized_checkpoint.beacon_block_root,
@@ -626,7 +626,7 @@ mod test {
     #[test]
     fn recent_genesis() {
         let validator_count = 8;
-        let genesis_time = 13371337;
+        let genesis_time = 13_371_337;
 
         let log = get_logger();
         let store = Arc::new(MemoryStore::open());
@@ -641,7 +641,7 @@ mod test {
 
         let chain = BeaconChainBuilder::new(MinimalEthSpec)
             .logger(log.clone())
-            .store(store.clone())
+            .store(store)
             .store_migrator(NullMigrator)
             .genesis_state(genesis_state)
             .expect("should build state using recent genesis")
@@ -662,7 +662,7 @@ mod test {
 
         assert_eq!(state.slot, Slot::new(0), "should start from genesis");
         assert_eq!(
-            state.genesis_time, 13371337,
+            state.genesis_time, 13_371_337,
             "should have the correct genesis time"
         );
         assert_eq!(