Fix flaky (#883)

* fix flaky test

* Delete dubbo-admin-server/.nondex directory

Co-authored-by: Ubuntu <rootadmin@vm001.qmx3d0w2ozeuflvliyjbpujvhf.bx.internal.cloudapp.net>

dubbo-admin-server/src/test/java/org/apache/dubbo/admin/common/util/UrlUtilsTest.java

@@ -19,14 +19,14 @@
 import org.junit.Assert;
 import org.junit.Test;
 
-import java.util.HashMap;
+import java.util.LinkedHashMap;
 import java.util.Map;
 
 public class UrlUtilsTest {
 
     @Test
     public void testParamsMapToString() {
-        Map<String, String[]> params = new HashMap<>();
+        Map<String, String[]> params = new LinkedHashMap<>();
         params.put("a", new String[]{"1", "2", "3"});
         params.put("b", new String[]{"8", "7", "6"});
         String result = UrlUtils.paramsMapToString(params);