Add print statements.

Author: sarahchen6

utils/socket-utils/src/main/java17/datadog/common/socket/TunnelingJdkSocket.java

@@ -123,34 +123,51 @@ public InputStream getInputStream() throws IOException {
       throw new SocketException("Socket input is shutdown");
     }
 
+    System.out.println("=====start=====");
+
     Selector selector = Selector.open();
+    System.out.println("=====1=====");
     unixSocketChannel.configureBlocking(false);
+    System.out.println("=====2=====");
     unixSocketChannel.register(selector, SelectionKey.OP_READ);
+    System.out.println("=====3=====");
     ByteBuffer buffer = ByteBuffer.allocate(256);
 
+    System.out.println("=====4=====");
+
     try {
       while (true) {
         if (selector.select(timeout) == 0) {
           System.out.println("Timeout (" + timeout + "ms) while waiting for data.");
           break;
         }
+        System.out.println("=====5=====");
         Iterator<SelectionKey> keyIterator = selector.selectedKeys().iterator();
+        System.out.println("=====6=====");
         while (keyIterator.hasNext()) {
+          System.out.println("=====7=====");
           SelectionKey key = keyIterator.next();
+          System.out.println("=====8=====");
           keyIterator.remove();
+          System.out.println("=====9=====");
           if (key.isReadable()) {
+            System.out.println("=====10=====");
             int r = unixSocketChannel.read(buffer);
+            System.out.println("=====11=====");
             if (r == -1) {
+              System.out.println("=====12=====");
               unixSocketChannel.close();
               System.out.println("Not accepting client messages anymore.");
               return InputStream.nullInputStream();
             }
           }
         }
+        System.out.println("=====13=====");
         buffer.flip();
         break;
       }
     } finally {
+      System.out.println("=====14=====");
       selector.close();
     }