Hardening/harness test cleanup round 2

All tests using orionCurl super function now plus a couple of minor bugs.
Take a look at how we render for other 'top level cases' for json. registerContextResponse::render, for example.
We probably do something like:

    std::string out = "";
    if (format == json)
      out = indent + "{\n";

instead of calling startTag.
Just do the same as in the other 'top level' cases.