Hardening/harness test cleanup round 2

All tests using orionCurl super function now plus a couple of minor bugs.
Found the problem. There was a typo in the query URL, it read "unsuscribe" instead of "unsubscribe". So the *problem* was that the *orionError* is the response-neutral way of saying "I can't handle this fatty".

I'm guessing this is the correct behaviour.

Fixed in https://github.com/telefonicaid/fiware-orion/commit/642b6a66e1b332f1f44e196abd85980aa0205b50