splitting part of util into smaller crates (#4956)

* split path module from util

* moved RotatingLogger from util to logger crate

* fix tests

* fix tests

* use only one version of ansi_term crate

ethcore/src/miner/price_info.rs

@@ -110,7 +110,7 @@ impl PriceInfo {
 fn should_get_price_info() {
 	use std::sync::Arc;
 	use std::time::Duration;
-	use util::log::init_log;
+	use ethcore_logger::init_log;
 	use util::{Condvar, Mutex};
 
 	init_log();

ethcore/src/miner/transaction_queue.rs

@@ -2454,6 +2454,7 @@ pub mod test {
 
 	#[test]
 	fn should_replace_same_transaction_when_has_higher_fee() {
+		use ethcore_logger::init_log;
 		init_log();
 		// given
 		let mut txq = TransactionQueue::default();