Clippy clean (#536)

* Change into_iter to iter

* Fix clippy 'easy' warnings

* Clippy eth2/utils

* Add struct NetworkInfo

* Clippy for types, utils, and beacon_node/store/src/iters.rs

* Cargo fmt

* Change foo to my_foo

* Remove complex signature

* suppress clippy warning for unit_value in benches

* Use enumerate instead of iterating over range

* Allow trivially_copy_pass_by_ref in serde_utils

eth2/utils/bls/src/secret_key.rs

@@ -80,8 +80,7 @@ mod tests {
     #[test]
     pub fn test_ssz_round_trip() {
         let original =
-            SecretKey::from_bytes("jzjxxgjajfjrmgodszzsgqccmhnyvetcuxobhtynojtpdtbj".as_bytes())
-                .unwrap();
+            SecretKey::from_bytes(b"jzjxxgjajfjrmgodszzsgqccmhnyvetcuxobhtynojtpdtbj").unwrap();
 
         let bytes = ssz_encode(&original);
         let decoded = SecretKey::from_ssz_bytes(&bytes).unwrap();