Remove running var from UnixDatagramSocketDummyStatsDServer

Author: sarahchen6

src/test/java/com/timgroup/statsd/UnixDatagramSocketDummyStatsDServer.java

@@ -11,7 +11,6 @@
 
 public class UnixDatagramSocketDummyStatsDServer extends DummyStatsDServer {
     private final DatagramChannel server;
-    private volatile boolean running = true;
 
     public UnixDatagramSocketDummyStatsDServer(String socketPath) throws IOException {
         if (ClientChannelUtils.hasNativeUdsSupport()) {
@@ -35,22 +34,14 @@ public UnixDatagramSocketDummyStatsDServer(String socketPath) throws IOException
 
     @Override
     protected boolean isOpen() {
-        return running && server.isOpen();
+        return server.isOpen();
     }
 
     protected void receive(ByteBuffer packet) throws IOException {
         server.receive(packet);
     }
 
-    @Override
     public void close() throws IOException {
-        running = false;  // Signal the listening thread to stop
-        try {
-            // Give the listening thread a chance to stop
-            Thread.sleep(50);
-        } catch (InterruptedException e) {
-            // Ignore
-        }
         try {
             server.close();
         } catch (Exception e) {