Fix: LiveStatusResponse.respond() output must always finish by a '\n'.
test_livestatus: changed many assert_(x==y) to assertEquals(x, y) for easier debug.
livestatus tests: need to eventually flatten the response.
Fix. compared one byte too mutch.
livestatus: Separators must be chars.
clean: livestatus_response: simplifications.
factorize mock_livestatus_broker_handle_request