(bug 45396) Use IETF example domains, not Britney

I don't know why Britney-Spears was in core parser tests as the example domain
name, but....well, suffice it to say she's not any more. We're using
example.org now, like sane people.

Change-Id: I47b53b94b4d7e8ad4a992de5e112685df48156c2