fix(generate): Update directive.spec.ts blueprint to fix incorret import (angular#1940)

Author: andrelmp

packages/angular-cli/blueprints/directive/files/__path__/__name__.directive.spec.ts

@@ -1,7 +1,7 @@
 /* tslint:disable:no-unused-variable */
 
 import { TestBed, async } from '@angular/core/testing';
-import { <%= classifiedModuleName %> } from './<%= dasherizedModuleName %>.directive';
+import { <%= classifiedModuleName %>Directive } from './<%= dasherizedModuleName %>.directive';
 
 describe('Directive: <%= classifiedModuleName %>', () => {
   it('should create an instance', () => {