fix(karma): Enable test of global scripts

[YonatanKra]

Fixes#2897

[YonatanKra]

It is strange - I've done only minor linting fixes, and travis failed (and only for node 6.0). There might be some error with the travis config.

[filipesilva]

Your PR would fix the issue. But this functionality belongs in https://github.com/angular/angular-cli/blob/master/packages/angular-cli/models/webpack-build-test.js instead, using a similar logic as the one found in https://github.com/angular/angular-cli/blob/master/packages/angular-cli/models/webpack-build-common.ts.

Could you apply the fix there instead?

[YonatanKra]

I've tried doing that, but it doesn't work when dealing with complex libraries (like Cesiumjs). That's why I've reverted to changing the karma.conf directly to include the whole node module.
Do you still want me to apply the change, even though it is less robust?

[filipesilva]

That's a tough cookie... especially because changes in #3402 will break this approach.

I think I need to find a more robust way of adding scripts to the test command, probably by compiling the test config via ts for both dev and release setups.

[filipesilva]

Superseded by #3543

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