init.d script for Ubuntu / LSB

I have created an init.d script for Infinispan Server for Ubuntu. I think this will work on other LSB systems, but it's untested. It is based off the init.d script + changes from my other pull request. It uses /usr/sbin/start-stop-daemon to start and stop the server.

The only thing I'm not happy about is the use of --background to launch, as standalone.sh stays running. It works but means we may miss errors from that script. I think that will require changes to standalone.sh.