backlog/169

Implements the issue https://github.com/telefonicaid/fiware-connectors/issues/169 (get version operation)
Yes, the reason is the Jetty server is run (as a new thread) from the `OrionRestHandler` class. This is a temporal solution, since the server should be run from the Flume's Node Application (tech debt), but in order to make both location run and configuration location coherent, I've put the management port configuration is such a place.