[e2e] Support exclude flag for e2e command

[victornoel]

As discussed with @filipesilva in #807, the e2e command would benefit from supporting the exclude flag.

It should accept the presence of the flag multiple times since protractor accepts an array for the exclude configuration (see https://github.com/angular/protractor/blob/master/lib/config.ts#L204).

More generally, it would equally good (at least for me) to support passing arbitrary parameters to protractor via ng e2e like it was the case before.

My use case: #807 (comment).

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