dissolve util (#7460)

* ethereum-types refactor in progress

* ethereum-types refactor in progress

* ethereum-types refactor in progress

* ethereum-types refactor in progress

* ethereum-types refactor finished

* removed obsolete util/src/lib.rs

* removed commented out code

ethcore/src/json_tests/difficulty.rs

@@ -16,7 +16,7 @@
 
 use ethjson;
 use header::Header;
-use bigint::prelude::U256;
+use ethereum_types::U256;
 use spec::Spec;
 
 pub fn json_difficulty_test(json_data: &[u8], spec: Spec) -> Vec<String> {

ethcore/src/json_tests/test_common.rs

@@ -14,14 +14,12 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
-pub use bigint::prelude::U256;
-pub use bigint::hash::H256;
-pub use util::*;
 use std::collections::HashSet;
 use std::io::Read;
 use std::fs::{File, read_dir};
 use std::path::Path;
 use std::ffi::OsString;
+pub use ethereum_types::{H256, U256, Address};
 
 pub fn run_test_path(p: &Path, skip: &[&'static str], runner: fn (json_data: &[u8]) -> Vec<String>) {
 	let path = Path::new(p);

ethcore/src/json_tests/trie.rs

@@ -16,7 +16,7 @@
 
 use ethjson;
 use trie::{TrieFactory, TrieSpec};
-use bigint::hash::H256;
+use ethereum_types::H256;
 use memorydb::MemoryDB;
 
 fn test_trie(json: &[u8], trie: TrieSpec) -> Vec<String> {