UI: Disable Jetty graceful shutdown for faster restarts

Graceful shutdown would be useful if you could deploy the UI in a high-availability configuration and direct new requests to a different instance while the current instance finished its outstanding ones. But as you can't, it's just making restarting Heritrix slow for little benefit.

Author: ato

engine/src/main/java/org/archive/crawler/Heritrix.java

@@ -520,6 +520,9 @@ protected void setupServer(Component component, int port, String address, String
         server.getContext().getParameters().add("keystorePath", keystorePath);
         server.getContext().getParameters().add("keystorePassword", keystorePassword);
         server.getContext().getParameters().add("keyPassword", keyPassword);
+
+        // This makes restarting faster. No point delaying shutdown as you can't cluster the Heritrix UI.
+        server.getContext().getParameters().add("shutdown.gracefully", "false");
     }
 
     /**