Medium: jboss: stop the JBoss daemon by sending a signal on JBoss 6

The stop script shutdown.sh no longer exists in JBoss 6.
Instead, sending SIGTERM is the proper way to stop the JBoss 6 daemon.
Medium: jboss: add jboss_base_dir parameter to support multi-instances on JBoss 6
Low: jboss: jboss_home is no longer unique in the multi-instances configuration based on jboss_base_dir
Low: ocft: jboss: add test case for jboss