Replace ethcore-logger with env-logger. (#10102)

* Replace ethcore-logger with env-logger.

* Fix logger initialization in WASM tests.

* uncomment logger initialization in secret store

* Don't use ethcore-logger in whisper.

* Move ethcore-logger within parity dir.

* Uncomment rest from secret-store.

* Use `let _ =` in private_contract for consistency

* `ok()` to `let _ =` fix in service

* Use `let _ = ` for state_db

ethcore/src/spec/spec.rs

@@ -1018,7 +1018,7 @@ mod tests {
 
 	#[test]
 	fn genesis_constructor() {
-		::ethcore_logger::init_log();
+		let _ = ::env_logger::try_init();
 		let spec = Spec::new_test_constructor();
 		let db = spec.ensure_db_good(get_temp_state_db(), &Default::default())
 			.unwrap();