separate trie from util and make its dependencies into libs:

* bytes
* hashdb
* memorydb
* nibbleslice
* nibblevec

sync/src/tests/helpers.rs

@@ -18,7 +18,7 @@ use std::collections::{VecDeque, HashSet, HashMap};
 use std::sync::Arc;
 use bigint::hash::H256;
 use parking_lot::RwLock;
-use util::*;
+use bytes::Bytes;
 use network::*;
 use tests::snapshot::*;
 use ethcore::client::{TestBlockChainClient, BlockChainClient, Client as EthcoreClient, ClientConfig, ChainNotify};

sync/src/tests/snapshot.rs

@@ -19,7 +19,7 @@ use std::sync::Arc;
 use hash::keccak;
 use bigint::hash::H256;
 use parking_lot::Mutex;
-use util::*;
+use bytes::Bytes;
 use ethcore::snapshot::{SnapshotService, ManifestData, RestorationStatus};
 use ethcore::header::BlockNumber;
 use ethcore::client::{EachBlockWith};