Fix test-publish failure in contracts packages

contracts/multisig/src/index.ts

@@ -0,0 +1,2 @@
+export * from './artifacts';
+export * from './wrappers';

contracts/protocol/src/index.ts

@@ -1,3 +1,2 @@
 export * from './artifacts';
 export * from './wrappers';
-export * from '../test/utils';

contracts/protocol/test/exchange/order_validator.ts

@@ -18,14 +18,13 @@ import * as _ from 'lodash';
 import {
     artifacts,
     ERC20ProxyContract,
-    ERC20Wrapper,
     ERC721ProxyContract,
-    ERC721Wrapper,
     ExchangeContract,
-    ExchangeWrapper,
     OrderValidatorContract,
 } from '../../src';
 
+import { ERC20Wrapper, ERC721Wrapper, ExchangeWrapper } from '../utils';
+
 chaiSetup.configure();
 const expect = chai.expect;
 const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);