hardening/232_jetty_startup

Implements issue https://github.com/telefonicaid/fiware-connectors/issues/232
You change the name of the flume-ng original script to flume-ng.disabled... Is the RPM building framework automatically filtering out anything ending with .disabled? Or the flume-ng.disabled will at the end being included in the .rpm file (I think this should be avoided, for cleaness)?