[misc] Use Jetty's recommended way of dealing with impossible exceptions

xwiki-platform-tools/xwiki-platform-tool-jetty/xwiki-platform-tool-jetty-listener/src/main/java/org/xwiki/tools/jetty/listener/NotifyListener.java

@@ -53,6 +53,7 @@ public void lifeCycleStarted(LifeCycle event)
             LOGGER.info(Messages.getString("jetty.startup.notification"), serverUrl);
         } catch (UnknownHostException ex) {
             // Shouldn't happen, localhost should be available
+            LOGGER.ignore(ex);
         }
         LOGGER.info(DELIMITER);
     }