The CLI jconsole integration should be optional

When connecting jconsole to a remote JVM using Remoting the CLI integration should be optional and silently fail if not available.

At the moment killing a jconsole that does not have access to domain management the following stack is logged: -

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Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: Error connecting to JBoss AS.
at org.jboss.as.cli.gui.JConsoleCLIPlugin.getTabs(JConsoleCLIPlugin.java:79)
at sun.tools.jconsole.VMPanel.createPluginTabs(VMPanel.java:641)
at sun.tools.jconsole.VMPanel.propertyChange(VMPanel.java:315)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:75)
at javax.swing.event.SwingPropertyChangeSupport$1.run(SwingPropertyChangeSupport.java:80)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:646)
at java.awt.EventQueue.access$000(EventQueue.java:84)
at java.awt.EventQueue$1.run(EventQueue.java:607)
at java.awt.EventQueue$1.run(EventQueue.java:605)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:616)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: java.util.concurrent.CancellationException: Operation was cancelled
at org.xnio.AbstractIoFuture.get(AbstractIoFuture.java:159)
at org.jboss.as.cli.gui.JConsoleCLIPlugin.connectUsingRemoting(JConsoleCLIPlugin.java:118)
at org.jboss.as.cli.gui.JConsoleCLIPlugin.connectCommandContext(JConsoleCLIPlugin.java:98)
at org.jboss.as.cli.gui.JConsoleCLIPlugin.getTabs(JConsoleCLIPlugin.java:76)
... 19 more