fix test

server/src/test/java/org/apache/iotdb/db/utils/EnvironmentUtils.java

@@ -175,7 +175,7 @@ public class EnvironmentUtils {
   }
 
   public static void cleanDir(String dir) throws IOException {
-    FileUtils.deleteDirectory(new File(dir));
+    FileUtils.deleteQuietly(new File(dir));
   }
 
   /**

server/src/test/java/org/apache/iotdb/db/writelog/WriteLogNodeTest.java

@@ -52,7 +52,6 @@ public class WriteLogNodeTest {
   public void setUp() throws Exception {
     enableWal = config.isEnableWal();
     config.setEnableWal(true);
-    config.setEnableVm(false);
     EnvironmentUtils.envSetUp();
   }
 
@@ -60,7 +59,6 @@ public class WriteLogNodeTest {
   public void tearDown() throws Exception {
     EnvironmentUtils.cleanEnv();
     config.setEnableWal(enableWal);
-    config.setEnableVm(true);
   }
 
   @Test