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

account_manager/src/main.rs

@@ -130,7 +130,6 @@ fn main() {
                 log,
                 "The account manager must be run with a subcommand. See help for more information."
             );
-            return;
         }
     }
 }