Fix init.d scripts

The environment variables the standalone.sh script are LAUNCH_JBOSS_IN_BACKGROUND and JBOSS_PIDFILE rather than LAUNCH_ISPN_SERVER_IN_BACKGROUND and ISPN_SERVER_PIDFILE.

I guess this is a change with Infinispan Server 6 from the old start up scripts. I presume the goal is to keep the startup scripts JBoss standard, so I have adopted the JBOSS naming convention in the init.d script.