If .spec changes, ng serve re-compiles and reload the app

[maxime1992]

Bug Report or Feature Request (mark with an x)

- [ x ] bug report -> please search issues before submitting
- [ ] feature request

Versions.

@angular/cli: 1.2.0
node: 8.0.0
os: linux x64
@angular/animations: 4.1.3
@angular/common: 4.1.3
@angular/compiler: 4.1.3
@angular/core: 4.1.3
@angular/flex-layout: 2.0.0-beta.8
@angular/forms: 4.1.3
@angular/http: 4.1.3
@angular/material: 2.0.0-beta.7
@angular/platform-browser: 4.1.3
@angular/platform-browser-dynamic: 4.1.3
@angular/router: 4.1.3
@angular/cli: 1.2.0
@angular/compiler-cli: 4.1.3
@angular/language-service: 4.1.3

Repro steps.

ng new some-repo
cd some-repo
ng serve

Open a unit test file with .spec, change something in it.
You should see the ng serve re-compiling the app and the browser reloading it.

But nothing changed in the app.

Desired functionality.

If a .spec changes, do not re-compile the app nor reload app in the browser.

[filipesilva]

This is a duplicate of #6238.

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