ng new my-project --skip-tests shouldn't generate karma/protractor files

The `--skip-tests` flag for `ng new` didn't quite match my expectations as a developer.

### Versions
```
Angular CLI: 1.6.0-beta.0
Node: 8.4.0
OS: linux x64
Angular:
...
```

### Repro steps
`ng new my-project --skip-tests`

### Observed behavior
```create my-project/README.md (1032 bytes)
create my-project/.angular-cli.json (1528 bytes)
create my-project/.editorconfig (245 bytes)
create my-project/.gitignore (516 bytes)
create my-project/src/assets/.gitkeep (0 bytes)
create my-project/src/environments/environment.prod.ts (51 bytes)
create my-project/src/environments/environment.ts (387 bytes)
create my-project/src/favicon.ico (5430 bytes)
create my-project/src/index.html (296 bytes)
create my-project/src/main.ts (370 bytes)
create my-project/src/polyfills.ts (2667 bytes)
create my-project/src/styles.css (80 bytes)
create my-project/src/test.ts (1085 bytes)
create my-project/src/tsconfig.app.json (211 bytes)
create my-project/src/tsconfig.spec.json (304 bytes)
create my-project/src/typings.d.ts (104 bytes)
create my-project/e2e/app.e2e-spec.ts (292 bytes)
create my-project/e2e/app.po.ts (208 bytes)
create my-project/e2e/tsconfig.e2e.json (235 bytes)
create my-project/karma.conf.js (923 bytes)
create my-project/package.json (1322 bytes)
create my-project/protractor.conf.js (722 bytes)
create my-project/tsconfig.json (363 bytes)
create my-project/tslint.json (2985 bytes)
create my-project/src/app/app.module.ts (316 bytes)
create my-project/src/app/app.component.css (0 bytes)
create my-project/src/app/app.component.html (1120 bytes)
create my-project/src/app/app.component.ts (207 bytes)
```

### Desired behavior
```create my-project/README.md (1032 bytes)
create my-project/.angular-cli.json (1528 bytes)
create my-project/.editorconfig (245 bytes)
create my-project/.gitignore (516 bytes)
create my-project/src/assets/.gitkeep (0 bytes)
create my-project/src/environments/environment.prod.ts (51 bytes)
create my-project/src/environments/environment.ts (387 bytes)
create my-project/src/favicon.ico (5430 bytes)
create my-project/src/index.html (296 bytes)
create my-project/src/main.ts (370 bytes)
create my-project/src/polyfills.ts (2667 bytes)
create my-project/src/styles.css (80 bytes)
create my-project/src/tsconfig.app.json (211 bytes)
create my-project/src/typings.d.ts (104 bytes)
create my-project/package.json (1322 bytes)
create my-project/tsconfig.json (363 bytes)
create my-project/tslint.json (2985 bytes)
create my-project/src/app/app.module.ts (316 bytes)
create my-project/src/app/app.component.css (0 bytes)
create my-project/src/app/app.component.html (1120 bytes)
create my-project/src/app/app.component.ts (207 bytes)
```

先執行 `ng new my-project --skip-tests`，並將產生的檔案與 issue 中列出的觀察到的檔案清單和期望的檔案清單進行比較。追蹤 `ng new` 的進入點及其對 `--skip-tests` 的處理，然後確認會省略 test.ts、tsconfig.spec.json、e2e、karma.conf.js 和 protractor.conf.js 檔案，同時產生其餘檔案。

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