[RFR]: 8220575: Replace hardcoded 127.0.0.1 in URLs with new URI builder

[Arthur Eubanks]

>
> > I was considering adding a buildURL() to URIBuilder since so many of
> > these URIs end up getting converted to a URL in the end. Not sure if
> > that's a good idea or not.
>
> Your call. If you do then maybe we should be considering adding:
>
>     public URIBuilder loopback() {
>        return host(InetAddress.getLoopbackAddress().getHostAddress());
>     }
>
> and I can't say I like URIBuilder::buildURL much - maybe
> URIBuilder::toURL would be a better name in that case?
>
> I've added `loopback()` and `toURL()`/`toURLUnchecked()` and used those in
the tests:
http://cr.openjdk.java.net/~aeubanks/8220575/webrev.02/index.html
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