Add additional amp cache test domains

[dknecht]

No description provided.

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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Once you've signed, please reply here (e.g. I signed it!) and we'll verify. Thanks.

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[sebastianbenz]

LGTM once the CLA is signed.

[dknecht]

I signed it! CLA signed under CloudFlare

[dknecht]

@sebastianbenz I might have messed up the CLA bot when I closed and reopened by accident.

[sebastianbenz]

It should work if your commit's email address is one of the email addresses associated with your companies CLA.

[googlebot]

CLAs look good, thanks!

[sebastianbenz]

Now live at https://rocky-sierra-1919.herokuapp.com.