VS Code language service is broken in 1.1.0 due to unessecary package

Bug Report or Feature Request (mark with an x)

- [x] bug report 

Versions.

cli 1.1.0 VS Code Angular Language Service 0.1.3

Repro steps.

1. Use VS Code with official Angular Language Service plugin installed.
2. Create a project with CLI.
3. Completion and error checking in HTML external templates doesn’t work.
4. npm uninstall @angular/language-service
5. Restart VS Code.
6. Now it works.

Desired functionality.

VS Code Angular Language Service plugin seems to use :

• it’s own install of @angular/language-service if it’s not present in node_modules
• if present, it uses the project dependency, and unfortunately, the plugin is not always up to date with the last release of @angular/language-service.

I see no use to pre-install @angular/language-service as the developer won’t use it directly, and plugins should manage their own dependencies to be sure to use the good version.

So I think commit bb99fac should be reverted.

I’ve open the same issue in VS Code Angular Language Service project too : angular/vscode-ng-language-service#102

[filipesilva]

@sumitarora can you take a look?

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