Add "defaultSeverity": "warning" to tslint.json when scaffolding app

[EvAlex]

Bug Report or Feature Request (mark with an x)

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

Versions.

@angular/cli: 1.2.1
node: 7.10.0
os: win32 x64
Windows 10

Repro steps.

1. Create an app: ng new tempApp
2. Open any .ts file, e.g. src/main.ts
3. Make any change that will break tslint rules, e.g. remove semicolon at the end of any line.
4. Run ng lint
5. You get ERROR: "path to main.ts"[line, col]: Missing semicolon

The log given by the failure.

ERROR: C:/Users/Alexander/tempApp/src/main.ts[11, 52]: Missing semicolon

Lint errors found in the listed files.

Desired functionality.

Default severity for broken tslint rules should be warning. Those red underlines make me feel that I made error, but in fact I just missed some tiny thing. This sometimes is very disturbing. I think, that syntax error or wrong type, missing member etc. error - are real errors, but tslint errors should be warnings by default.

Mention any other details that might be useful.

[clydin]

Unfortunately, the situation has some complexity to it. Please see this PR for details.

[filipesilva]

Closing as per @clydin's comment.

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