JENA-442 Update Fuseki server script: 
1) Allow config file to be specified 
2) Run as a different user 
3) Add support for start-stop-daemon (daemontools)

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1475983 13f79535-47bb-0310-9956-ffa450edef68