ISPN-2867 Use System.exit() to quit the CLI to workaround the fact that JBoss Remoting leaves threads hanging
ISPN-2860 RHQ plugin should ignore spurious MBeans returned by the AS7 MBeanServer
          Add missing displayNames to attributes and operations
          Make the RHQ plugin descriptor generator throw an exception if an attribute or operation is missing the displayName
ISPN-2867 Do not test Main to avoid System.exit() affecting test
completion