message: Fix microservices auth tests
  These tests hardcoded
diff: import * as should from 'should';
  import * as nock from 'nock';
  import * as Bluebird from 'bluebird';
  +import { Environments } from '../../src/index';
  const co = Bluebird.coroutine;
  import * as BitGoJS from '../../src/index';
  @@ -79,7 +80,6 @@ describe('BitGo Prototype Methods', function() {
  describe('Authenticate in Microservices', () => {
  let bitgo;
  const microservicesUri = 'https://microservices.uri';
  - const uri = 'https://test.bitgo.com';
  const authenticateRequest = {
  username: 'test@bitgo.com',
  password: 'password',
  @@ -90,7 +90,7 @@ describe('BitGo Prototype Methods', function() {
  };
  it('goes to microservices', co(function *() {
  - bitgo = new TestBitGo({ env: 'custom', microservicesUri });
  + bitgo = new TestBitGo({ env: 'mock', microservicesUri });
  const scope = nock(microservicesUri)
  .post('/api/auth/v1/session')
  .reply(200, { user: 'test@bitgo.com', access_token: 'token12356' });
  @@ -100,8 +100,8 @@ describe('BitGo Prototype Methods', function() {
  }));
  it('goes to normal uri', co(function *() {
  - bitgo = new TestBitGo();
  - const scope = nock(uri)
  + bitgo = new TestBitGo({ env: 'mock' });
  + const scope = nock(Environments[bitgo.getEnv()].uri)
  .post('/api/v1/user/login')
  .reply(200, { user: 'test@bitgo.com', access_token: 'token12356' });
  