Various minor fixes (#2860)

* Make sr-api-macros benchmark work again

It broke with 4f888f34d3.

* Give better indication of import progress

* Only send consensus info when explicitly enabled

This is only necessary for validators and they can
explicitly enable it via

	--telemetry-url 'wss://telemetry.polkadot.io 1'

(or some other endpoint)

* Remove unnecessary mutable

* Fix style

substrate/test-utils/transaction-factory/src/complex_mode.rs

@@ -83,7 +83,7 @@ where
 	let seed = factory_state.start_number() + factory_state.block_no();
 	let to = RA::gen_random_account_id(&seed);
 
-	let mut amount;
+	let amount;
 	if factory_state.round() == RA::Number::zero() {
 		amount = RA::minimum_balance() * factory_state.rounds();
 	} else {