Separate migrations from util (#6690)

* separate migration from util and make its dependencies into libs:

* snappy
* kvdb
* error
* common

* renamed common -> macros

* util error does not depend on snappy module

* ethsync does not depend on util nor ethcore_error

* nibbleslice and nibblevec merged with patricia_trie crate

* removed unused dependencies from util

* util journaldb traits does not need to be public

* util_error

* fixed ethcore compile error

* ignore .swo files

* Update chain.rs

sync/src/tests/consensus.rs

@@ -17,7 +17,6 @@
 use std::sync::Arc;
 use hash::keccak;
 use bigint::prelude::U256;
-use util::*;
 use io::{IoHandler, IoContext, IoChannel};
 use ethcore::client::{BlockChainClient, Client};
 use ethcore::service::ClientIoMessage;
@@ -27,7 +26,7 @@ use ethcore::transaction::*;
 use ethcore::account_provider::AccountProvider;
 use ethkey::{KeyPair, Secret};
 use super::helpers::*;
-use SyncConfig;
+use {SyncConfig, Address};
 
 struct TestIoHandler {
 	client: Arc<Client>,

sync/src/tests/helpers.rs

@@ -291,7 +291,7 @@ impl TestNet<EthPeer<EthcoreClient>> {
 		let client = EthcoreClient::new(
 			ClientConfig::default(),
 			&spec,
-			Arc::new(::util::kvdb::in_memory(::ethcore::db::NUM_COLUMNS.unwrap_or(0))),
+			Arc::new(::kvdb::in_memory(::ethcore::db::NUM_COLUMNS.unwrap_or(0))),
 			Arc::new(Miner::with_spec_and_accounts(&spec, accounts)),
 			IoChannel::disconnected(),
 		).unwrap();