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/eth2-libp2p/src/rpc/handler.rs

@@ -145,7 +145,7 @@ where
         // When terminating a stream, report the stream termination to the requesting user via
         // an RPC error
         let error = RPCErrorResponse::ServerError(ErrorMessage {
-            error_message: "Request timed out".as_bytes().to_vec(),
+            error_message: b"Request timed out".to_vec(),
         });
 
         // The stream termination type is irrelevant, this will terminate the
@@ -510,7 +510,7 @@ where
             // notify the user
             return Ok(Async::Ready(ProtocolsHandlerEvent::Custom(
                 RPCEvent::Error(
-                    stream_id.get_ref().clone(),
+                    *stream_id.get_ref(),
                     RPCError::Custom("Stream timed out".into()),
                 ),
             )));