refactor(@angular-devkit/build-angular): remove unused utility functions

Author: clydin

packages/angular_devkit/build_angular/src/utils/index.ts

@@ -5,7 +5,6 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-
 export * from './default-progress';
 export * from './delete-output-dir';
 export * from './differential-loading';
@@ -15,5 +14,3 @@ export * from './normalize-asset-patterns';
 export * from './normalize-source-maps';
 export * from './normalize-optimization';
 export * from './normalize-builder-schema';
-export * from './normalize-karma-schema';
-export * from './normalize-webpack-server-schema';