AMQ-6820 - Properly handle ClosedChannelException

When a ClosedChannelException occurs inside SelectorSelection properly
call the transport listener onError() method to handle cleanup and
logging.

activemq-client/src/main/java/org/apache/activemq/transport/nio/SelectorSelection.java

@@ -44,7 +44,7 @@ public final class SelectorSelection {
                 try {
                     SelectorSelection.this.key = selectable.register(worker.selector, 0, SelectorSelection.this);
                 } catch (Exception e) {
-                    e.printStackTrace();
+                    onError(e);
                 }
             }
         });