Reviewer Andy: Enable live test suite to be used against a CW AIO node

Andy, please can you review.  These changes allow the live test framework to run against a CW-AIO node. The key change is to allow overriding of the Ellis FQDN (because we need it to be http://<PROXY>, not http://ellis.<DOMAIN>).
Tested by running the tests against an AIO, and also against dogfood for the non-AIO case.